1.
National Register of Historic Places
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The National Register of Historic Places is the United States federal governments official list of districts, sites, buildings, structures, and objects deemed worthy of preservation. The passage of the National Historic Preservation Act in 1966 established the National Register, of the more than one million properties on the National Register,80,000 are listed individually. The remainder are contributing resources within historic districts, each year approximately 30,000 properties are added to the National Register as part of districts or by individual listings. For most of its history the National Register has been administered by the National Park Service and its goals are to help property owners and interest groups, such as the National Trust for Historic Preservation, coordinate, identify, and protect historic sites in the United States. While National Register listings are mostly symbolic, their recognition of significance provides some financial incentive to owners of listed properties, protection of the property is not guaranteed. During the nomination process, the property is evaluated in terms of the four criteria for inclusion on the National Register of Historic Places, the application of those criteria has been the subject of criticism by academics of history and preservation, as well as the public and politicians. Occasionally, historic sites outside the proper, but associated with the United States are also listed. Properties can be nominated in a variety of forms, including individual properties, historic districts, the Register categorizes general listings into one of five types of properties, district, site, structure, building, or object. National Register Historic Districts are defined geographical areas consisting of contributing and non-contributing properties, some properties are added automatically to the National Register when they become administered by the National Park Service. These include National Historic Landmarks, National Historic Sites, National Historical Parks, National Military Parks/Battlefields, National Memorials, on October 15,1966, the Historic Preservation Act created the National Register of Historic Places and the corresponding State Historic Preservation Offices. Initially, the National Register consisted of the National Historic Landmarks designated before the Registers creation, approval of the act, which was amended in 1980 and 1992, represented the first time the United States had a broad-based historic preservation policy. To administer the newly created National Register of Historic Places, the National Park Service of the U. S. Department of the Interior, hartzog, Jr. established an administrative division named the Office of Archeology and Historic Preservation. Hartzog charged OAHP with creating the National Register program mandated by the 1966 law, ernest Connally was the Offices first director. Within OAHP new divisions were created to deal with the National Register, the first official Keeper of the Register was William J. Murtagh, an architectural historian. During the Registers earliest years in the late 1960s and early 1970s, organization was lax and SHPOs were small, understaffed, and underfunded. A few years later in 1979, the NPS history programs affiliated with both the U. S. National Parks system and the National Register were categorized formally into two Assistant Directorates. Established were the Assistant Directorate for Archeology and Historic Preservation and the Assistant Directorate for Park Historic Preservation, from 1978 until 1981, the main agency for the National Register was the Heritage Conservation and Recreation Service of the United States Department of the Interior. In February 1983, the two assistant directorates were merged to promote efficiency and recognize the interdependency of their programs, jerry L. Rogers was selected to direct this newly merged associate directorate
2.
Phoenix, Arizona
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Phoenix is the capital and most populous city of the U. S. state of Arizona. Phoenix is the anchor of the Phoenix metropolitan area, also known as the Valley of the Sun, the metropolitan area is the 12th largest by population in the United States, with approximately 4.3 million people as of 2010. Settled in 1867 as a community near the confluence of the Salt and Gila Rivers. Located in the reaches of the Sonoran Desert, Phoenix has a subtropical desert climate. Despite this, its canal system led to a farming community, many of the original crops remaining important parts of the Phoenix economy for decades, such as alfalfa, cotton, citrus. The city averaged a four percent annual growth rate over a 40-year period from the mid-1960s to the mid-2000s. This growth rate slowed during the Great Recession of 2007–09, and has rebounded slowly, Phoenix is the cultural center of the Valley of the Sun, as well as the entire state. For more than 2,000 years, the Hohokam people occupied the land that would become Phoenix, the Hohokam created roughly 135 miles of irrigation canals, making the desert land arable. Paths of these canals would later used for the modern Arizona Canal, Central Arizona Project Canal. The Hohokam also carried out trade with the nearby Anasazi, Mogollon and Sinagua. It is believed that between 1300 and 1450, periods of drought and severe floods led to the Hohokam civilizations abandonment of the area. After the departure of the Hohokam, groups of Akimel Oodham, Tohono Oodham and Maricopa tribes began to use the area, as well as segments of the Yavapai and Apache. The Oodham were offshoots of the Sobaipuri tribe, who in turn were thought to be the descendants of the formerly urbanized Hohokam and their crops included corn, beans, and squash for food, while cotton and tobacco were also cultivated. Mostly a peaceful group, they did together with the Maricopa for their mutual protection against incursions by both the Yuma and Apache tribes. The Tohono Oodham lived in the region as well, but their concentration was to the south. Living in small settlements, the Oodham were seasonal farmers who took advantage of the rains and they also hunted local game such as deer, rabbit, and javalina for meat. When the Mexican–American War ended in 1848, Mexico ceded its northern zone to the United States, the Phoenix area became part of the New Mexico Territory. In 1863 the mining town of Wickenburg was the first to be established in what is now Maricopa County, at the time Maricopa County had not yet been incorporated, the land was within Yavapai County, which included the major town of Prescott to the north of Wickenburg
3.
George Franklin Barber
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George Franklin Barber was an American architect best known for his residential designs, which he marketed worldwide through a series of mail-order catalogs. Over four dozen Barber houses are listed on the National Register of Historic Places. Barber began designing houses in his native DeKalb, Illinois, in the late 1880s, before moving his base to Knoxville, Tennessee. His first widely circulated catalog, Cottage Souvenir No,2, contained designs and floor plans for fifty-nine houses, mostly in the Queen Anne style, as well as Barbers architectural philosophy and tips for homebuilders. Later catalogs contained more Colonial designs, by the time his catalog business ended in 1908, Barber had sold upwards of 20,000 plans. Barber was the father of Charles I, Barber, who went on to become a successful architect in his own right, and designed a number of notable buildings in the Knoxville area during the first half of the 20th century. BarberMcMurry, an architectural firm cofounded by Charles Barber in 1915, Barber was born in DeKalb, Illinois, in 1854, the son of Lyman and Cornelia Spring Barber. While still a child, he moved to Marmaton, Kansas, where he lived on the farm of his sister, Olive. By the 1870s, he owned an adjacent farm, where he raised plants which he advertised as ornamental nursery stock, during this period, he learned architecture through mail-order books, namely George Pallisers American Cottage Homes and technical books published by A. J. In 1884, Barber patented a nail-holding attachment for hammers, by the mid-1880s, Barber was back in DeKalb, where he produced his first architectural designs working for his brothers construction firm, Barber and Boardman, Contractors and Builders. In 1887 or early 1888, Barber published The Cottage Souvenir, crudely produced on punched card stock and tied together with a piece of yarn, the earliest buildings constructed from Barbers designs include the Charles E. Bradt House and the Congregational Church, both in DeKalb. The Bradt house was featured in the March 1888 issue of Carpentry, in late 1888, Barber relocated to Knoxville, Tennessee, in hopes that the citys mountainous climate would be better for his declining health. He briefly partnered with Minnesota-born architect Martin Parmalee, but the partnership proved unsatisfactory, in 1892, he established a firm with one of his clients, J. C. White, handling the firms business aspects. Barber also became a partner in the Edgewood Land Improvement Company, in 1890, Barber published The Cottage Souvenir No. 2, which contained 59 house plans, as well as plans for 2 barns, a chapel, a church,2 storefronts and this catalog and its subsequent revisions led to an explosion in orders for Barbers firm. He also remained active on a level in Knoxville, with the Romanesque-inspired Isaac Ziegler House on 4th Avenue. Newman, which stands in Old North Knoxville. Around 1895, Barber parted ways with White and formed a new firm with a new partner, in 1896, the growing firm moved into the Barber-designed French and Roberts Building on Gay Street, with the firms thirty draftsmen and twenty secretaries occupying an entire floor
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Queen Anne style architecture in the United States
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In the United States, Queen Anne style architecture was popular from roughly 1880 to 1910. Queen Anne was one of a number of architectural styles to emerge during the Victorian era. Within the Victorian era timeline, Queen Anne style followed the Stick style and preceded the Richardsonian Romanesque, the style bears almost no relationship to the English Baroque architecture produced in the actual reign of Queen Anne from 1702 to 1714. It is loosely used of a range of picturesque buildings with free Renaissance details rather than of a specific formulaic style in its own right. Queen Anne Style buildings in America came into vogue in the 1880s, the popularity of high Queen Anne Style waned in the early 1900s, but some elements, such as the wraparound front porch, continued to be found on buildings into the 1920s. There are triple windows of Serlian motif and a two-storey oriel that projects asymmetrically, the Astral Apartments, built in Brooklyn in 1885–1886 to house dock workers, provides another similar, and larger, example of red brick and terracotta Queen Anne architecture in New York. E. Francis Baldwins stations for the Baltimore and Ohio Railroad, built variously of brick, the most famous American Queen Anne residence is the William Carson Mansion of Eureka, California. Newsom and Newsom, notable builder-architects of 19th Century California homes and public buildings, all styles described below as well as others are present in this example of American Queen Anne Style. Dentils, classical columns, spindle work, oriel and bay windows, horizontal bands of leaded windows, monumental chimneys, painted balustrades, front gardens often had wooden fences. Smaller and somewhat plainer houses can also be Queen Anne, the William G. Harrison House, built 1904 in rural Nashville, Georgia, is an example. The Shingle Style in America was made popular by the rise of the New England school of architecture, in the Shingle Style, English influence was combined with the renewed interest in Colonial American architecture which followed the 1876 celebration of the Centennial. This impression of the passage of time was enhanced by the use of shingles. Some architects, in order to attain a look on a new building, even had the cedar shakes dipped in buttermilk, dried and then installed. The Shingle Style also conveyed a sense of the house as continuous volume, however, the most famous Shingle Style house built in America was Kragsyde, the summer home commissioned by Bostonian G. Nixon Black, from Peabody and Stearns. Kragsyde was built atop the rocky shore near Manchester-By-the-Sea, Massachusetts. Many of the concepts of the Shingle Style were adopted by Gustav Stickley, Category, Victorian architectural styles Category, Victorian architecture in the United States
5.
Victorian architecture
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Victorian architecture is a series of architectural revival styles in the mid-to-late 19th century. Victorian refers to the reign of Queen Victoria, called the Victorian era, however, many elements of what is typically termed Victorian architecture did not become popular until later in Victorias reign. The styles often included interpretations and eclectic revivals of historic styles mixed with the introduction of middle east, the name represents the British and French custom of naming architectural styles for a reigning monarch. Within this naming and classification scheme, it follows Georgian architecture and later Regency architecture, during the early 19th century, the romantic medieval Gothic revival style was developed as a reaction to the symmetry of Palladianism, and such buildings as Fonthill Abbey were built. Paxton also continued to build houses as Mentmore Towers, in the still popular English Renaissance styles. In this era of prosperity new methods of construction were developed, other notable Scottish architects of this period are Archibald Simpson and Alexander Marshall Mackenzie whose stylistically varied work can be seen in the architecture of Aberdeen. Victorian architecture usually has many intricate window frames inspired by the famous architect Elliot Rae, some chose the United States, and others went to Canada, Australia, and New Zealand. Normally, they applied architectural styles that were fashionable when they left England, thus, the influence of English architecture spread across the world. Several prominent architects produced English-derived designs around the world, including William Butterfield, the Victorian period flourished in Australia and is generally recognised as being from 1840 to 1890, which saw a gold rush and population boom during the 1880s in the state of Victoria. There were fifteen styles that predominated, The Arts and Crafts style and Queen Anne style are considered to be part of the Federation Period, during the British colonial period of British Ceylon, Sri Lanka Law College, Sri Lanka College of Technology and the Galle Face Hotel. In the United States, Victorian architecture generally describes styles that were most popular between 1860 and 1900, a list of these styles most commonly includes Second Empire, Stick-Eastlake, Folk Victorian, Queen Anne, Richardsonian Romanesque, and Shingle. As in the United Kingdom, examples of Gothic Revival and Italianate continued to be constructed during this period, some historians classify the later years of Gothic Revival as a distinctive Victorian style named High Victorian Gothic. Stick-Eastlake, a manner of geometric, machine-cut decorating derived from Stick, on the other hand, terms such as Painted Ladies or gingerbread may be used to describe certain Victorian buildings, but do not constitute a specific style. The names of architectural styles varied between countries, many homes combined the elements of several different styles and are not easily distinguishable as one particular style or another. San Francisco is well known for its extensive Victorian architecture, particularly in the Haight-Ashbury, Lower Haight, Alamo Square, Noe Valley, Castro, Nob Hill, the extent to which any one is the largest surviving example is debated, with numerous qualifications. The Distillery District in Toronto, Ontario contains the largest and best preserved collection of Victorian-era industrial architecture in North America, cabbagetown is the largest and most continuous Victorian residential area in North America. Other Toronto Victorian neighbourhoods include The Annex, Parkdale, and Rosedale, in the USA, the South End of Boston is recognized by the National Register of Historic Places as the oldest and largest Victorian neighborhood in the country. Old Louisville in Louisville, Kentucky also claims to be the nations largest Victorian neighborhood, richmond, Virginia is home to several large Victorian neighborhoods, the most prominent being The Fan
6.
San Francisco
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San Francisco, officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California. It is the birthplace of the United Nations, the California Gold Rush of 1849 brought rapid growth, making it the largest city on the West Coast at the time. San Francisco became a consolidated city-county in 1856, after three-quarters of the city was destroyed by the 1906 earthquake and fire, San Francisco was quickly rebuilt, hosting the Panama-Pacific International Exposition nine years later. In World War II, San Francisco was a port of embarkation for service members shipping out to the Pacific Theater. Politically, the city votes strongly along liberal Democratic Party lines, San Francisco is also the headquarters of five major banking institutions and various other companies such as Levi Strauss & Co. Dolby, Airbnb, Weebly, Pacific Gas and Electric Company, Yelp, Pinterest, Twitter, Uber, Lyft, Mozilla, Wikimedia Foundation, as of 2016, San Francisco is ranked high on world liveability rankings. The earliest archaeological evidence of habitation of the territory of the city of San Francisco dates to 3000 BC. Upon independence from Spain in 1821, the became part of Mexico. Under Mexican rule, the system gradually ended, and its lands became privatized. In 1835, Englishman William Richardson erected the first independent homestead, together with Alcalde Francisco de Haro, he laid out a street plan for the expanded settlement, and the town, named Yerba Buena, began to attract American settlers. Commodore John D. Sloat claimed California for the United States on July 7,1846, during the Mexican–American War, montgomery arrived to claim Yerba Buena two days later. Yerba Buena was renamed San Francisco on January 30 of the next year, despite its attractive location as a port and naval base, San Francisco was still a small settlement with inhospitable geography. The California Gold Rush brought a flood of treasure seekers, with their sourdough bread in tow, prospectors accumulated in San Francisco over rival Benicia, raising the population from 1,000 in 1848 to 25,000 by December 1849. The promise of fabulous riches was so strong that crews on arriving vessels deserted and rushed off to the gold fields, leaving behind a forest of masts in San Francisco harbor. Some of these approximately 500 abandoned ships were used at times as storeships, saloons and hotels, many were left to rot, by 1851 the harbor was extended out into the bay by wharves while buildings were erected on piles among the ships. By 1870 Yerba Buena Cove had been filled to create new land, buried ships are occasionally exposed when foundations are dug for new buildings. California was quickly granted statehood in 1850 and the U. S. military built Fort Point at the Golden Gate, silver discoveries, including the Comstock Lode in Nevada in 1859, further drove rapid population growth. With hordes of fortune seekers streaming through the city, lawlessness was common, and the Barbary Coast section of town gained notoriety as a haven for criminals, prostitution, entrepreneurs sought to capitalize on the wealth generated by the Gold Rush
7.
Moon gate
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A Moon Gate is a circular opening in a garden wall that acts as a pedestrian passageway, and a traditional architectural element in Chinese gardens. Moon Gates have many different spiritual meanings for every piece of tile on the gate, the sloping roofs of the gate represent the half moon of the Chinese Summers and the tips of the tiles of the roof have talismans on the ends of them. Chinese Gardens are often used as a display of class and beauty in many different Western Cultures, the purpose of these gates is to serve as a very inviting entrance into gardens of the rich upper class in China. The gates were only found in the gardens of wealthy Chinese nobles. Moon Gates were incorporated into the architecture of Bermuda in the late 19th century, the Bermuda Moon Gate is slightly different from the original Chinese design, as it is often left free-standing or attached to low wall. In Bermuda, it is regarded as good luck for newlyweds to step through the gate
8.
Italianate architecture
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The Italianate style of architecture was a distinct 19th-century phase in the history of Classical architecture. The style of architecture that was created, though also characterised as Neo-Renaissance, was essentially of its own time. The Italianate style was first developed in Britain about 1802 by John Nash and this small country house is generally accepted to be the first Italianate villa in England, from which is derived the Italianate architecture of the late Regency and early Victorian eras. The Italianate style was developed and popularised by the architect Sir Charles Barry in the 1830s. Barrys Italianate style drew heavily for its motifs on the buildings of the Italian Renaissance, the style was not confined to England and was employed in varying forms, long after its decline in popularity in Britain, throughout Northern Europe and the British Empire. From the late 1840s to 1890 it achieved popularity in the United States. A late intimation of Nashs development of the Italianate style was his 1805 design of Sandridge Park at Stoke Gabriel in Devon. Later examples of the Italianate style in England tend to take the form of Palladian-style building often enhanced by a belvedere complete with Renaissance-type balustrading at the roof level. Sir Charles Barry, most notable for his works on the Tudor, unlike Nash he found his inspiration in Italy itself. Barry drew heavily on the designs of the original Renaissance villas of Rome, the Lazio and his most defining work in this style was the large Neo-Renaissance mansion Cliveden. Thomas Cubitt, a London building contractor, incorporated simple classical lines of the Italianate style as defined by Sir Charles Barry into many of his London terraces. Following the completion of Osborne House in 1851, the became a popular choice of design for the small mansions built by the new. These were mostly built in cities surrounded by large but not extensive gardens, on occasions very similar, if not identical, designs to these Italianate villas would be topped by mansard roofs, and then termed chateauesque. However, after a modest spate of Italianate villas, and French chateaux by 1855 the most favoured style of an English country house was Gothic, the Italianate style came to the small town of Newton Abbot in Devon, with Isambard Brunels atmospheric railway pumping houses. An example that is not very known, but a clear example of Italianate architecture, is St. Christophers Anglican church in Hinchley Wood, Surrey. When the Ottomans exiled Fakhreddine to Tuscany in 1613, he entered an alliance with the Medicis, upon his return to Lebanon in 1618, he began modernising Lebanon. He developed an industry, upgraded olive-oil production, and brought with him numerous Italian engineers who began the construction of mansions. The cities of Beirut and Sidon were especially built in the Italianate style, the influence of these buildings, such as the ones in Deir el Qamar, influenced building in Lebanon for many centuries and continues to the present time
9.
Octagon
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In geometry, an octagon is an eight-sided polygon or 8-gon. A regular octagon has Schläfli symbol and can also be constructed as a truncated square, t. A truncated octagon, t is a hexadecagon, t, the sum of all the internal angles of any octagon is 1080°. As with all polygons, the external angles total 360°, the midpoint octagon of a reference octagon has its eight vertices at the midpoints of the sides of the reference octagon. A regular octagon is a figure with sides of the same length. It has eight lines of symmetry and rotational symmetry of order 8. A regular octagon is represented by the Schläfli symbol, the internal angle at each vertex of a regular octagon is 135°. The area of an octagon of side length a is given by A =2 cot π8 a 2 =2 a 2 ≃4.828 a 2. In terms of the circumradius R, the area is A =4 sin π4 R2 =22 R2 ≃2.828 R2. In terms of the r, the area is A =8 tan π8 r 2 =8 r 2 ≃3.314 r 2. These last two coefficients bracket the value of pi, the area of the unit circle. The area can also be expressed as A = S2 − a 2, where S is the span of the octagon, or the second-shortest diagonal, and a is the length of one of the sides, or bases. This is easily proven if one takes an octagon, draws a square around the outside and then takes the corner triangles and places them with right angles pointed inward, the edges of this square are each the length of the base. Given the length of a side a, the span S is S = a 2 + a + a 2 = a ≈2.414 a. The area is then as above, A =2 − a 2 =2 a 2 ≈4.828 a 2, expressed in terms of the span, the area is A =2 S2 ≈0.828 S2. Another simple formula for the area is A =2 a S, more often the span S is known, and the length of the sides, a, is to be determined, as when cutting a square piece of material into a regular octagon. From the above, a ≈ S /2.414, the two end lengths e on each side, as well as being e = a /2, may be calculated as e = /2. The circumradius of the octagon in terms of the side length a is R = a
10.
National Park Service
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It was created on August 25,1916, by Congress through the National Park Service Organic Act and is an agency of the United States Department of the Interior. As of 2014, the NPS employs 21,651 employees who oversee 417 units, the National Park Service celebrated its centennial in 2016. National parks and national monuments in the United States were originally individually managed under the auspices of the Department of the Interior, the movement for an independent agency to oversee these federal lands was spearheaded by business magnate and conservationist Stephen Mather, as well as J. Horace McFarland. With the help of journalist Robert Sterling Yard, Mather ran a publicity campaign for the Department of the Interior and they wrote numerous articles that praised the scenic and historic qualities of the parks and their possibilities for educational, inspirational, and recreational benefits. This campaign resulted in the creation of a National Park Service, Mather became the first director of the newly formed NPS. On March 3,1933, President Herbert Hoover signed the Reorganization Act of 1933, the act would allow the President to reorganize the executive branch of the United States government. It wasnt until later that summer when the new President, Franklin D. Roosevelt, President Roosevelt agreed and issued two Executive orders to make it happen. In 1951, Conrad Wirth became director of the National Park Service, the demand for parks after the end of the World War II had left the parks overburdened with demands that could not be met. In 1952, with the support of President Dwight D. Eisenhower, he began Mission 66, New parks were added to preserve unique resources and existing park facilities were upgraded and expanded. In 1966, as the Park Service turned 50 years old, emphasis began to turn from just saving great and wonderful scenery, Director George Hartzog began the process with the creation of the National Lakeshores and then National Recreation Areas. Since its inception in 1916, the National Park Service has managed each of the United States national parks, Yellowstone National Park was the first national park in the United States. In 1872, there was no government to manage it. Yosemite National Park began as a park, the land for the park was donated by the federal government to the state of California in 1864 for perpetual conservation. Yosemite was later returned to federal ownership, at first, each national park was managed independently, with varying degrees of success. In Yellowstone, the staff was replaced by the U. S. Army in 1886. Due to the irregularities in managing these national treasures, Stephen Mather petitioned the government to improve the situation. In response, Secretary of the Interior Franklin K. Lane challenged him to lobby for creating a new agency, Mather was successful with the ratification of the National Park Service Organic Act in 1916. Later, the agency was given authority over other protected areas, the National Park System includes all properties managed by the National Park Service
11.
Heritage Documentation Programs
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These programs were established to document historic places in the United States. Records consist of measured drawings, archival photographs, and written reports, in 1933, NPS established the Historic American Buildings Survey following a proposal by Charles E. Peterson, a young landscape architect in the agency. It was founded as a constructive program for architects, draftsmen. Guided by field instructions from Washington, D. C. the first HABS recorders were tasked with documenting a representative sampling of Americas architectural heritage, by creating an archive of historic architecture, HABS provided a database of primary source material and documentation for the then-fledgling historic preservation movement. Earlier private projects included the White Pine Series of Architectural Monographs, notable HABS photographers include Jack Boucher, who worked for the project for over 40 years. The Historic American Engineering Record program was founded on January 10,1969, by NPS, HAER documents historic mechanical and engineering artifacts. Since the advent of HAER, the program is typically called HABS/HAER. Today much of the work of HABS/HAER is done by student teams during the summer, eric DeLony headed HAER from 1971 to 2003. In October 2000, NPS and the American Society of Landscape Architects established a sister program, a predecessor, the Historic American Landscape and Garden Project, recorded historic Massachusetts gardens between 1935 and 1940. That project was funded by the Works Progress Administration, but was administered by HABS, the permanent collection of HABS/HAER/HALS are housed at the Library of Congress, which was established in 1790 as the replacement reference library of the United States Congress. It has since expanded to serve as the National Library of the United States, U. S. publishers are required to deposit a copy of every copyrighted and published work, book monograph. As a branch of the United States Government, its works are in the public domain in the US. Many images, drawings, and documents are available through the Prints and Photographs Online Catalog, including proposed, demolished, and existing structures, locales, projects, and designs. Jack Boucher, former HABS/HAER photographer Jet Lowe, former HAER photographer National Register of Historic Places HAER,30 Years of Recording Our Technological Heritage, IA, The Journal of the Society for Industrial Archeology. Documenting Complexity, The Historic American Engineering Record and Americas Technological History, IA, The Journal of the Society for Industrial Archeology. National Park Service−NPS, official Heritage Documentation Programs website
