William Herman Rau was an American photographer who was active primarily in the latter half of the 19th and early 20th centuries. He is best remembered for his stereo cards of sites around the world, and for his panoramic photographs of sites along the Pennsylvania Railroad.

William H. Bell was an English-born American photographer in the latter half of the 19th century. Many of his photographs documenting war-time diseases and combat injuries were published in the medical book, Medical and Surgical History of the War of the Rebellion, and he took photographs of western landscapes taken as part of the Wheeler expedition in 1872. In his later years, he wrote articles on the dry plate process and other techniques for various photography journals.