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An illustration of the first macadamized road in the United States between Boonsboro and Hagerstown in Maryland in 1823; in the foreground, workers ar
An illustration of the first macadamized road in the United States between Boonsboro and Hagerstown in Maryland in 1823; in the foreground, workers are breaking stones "so as not to exceed 6 ounces (170 g) in weight or to pass a two-inch (5 cm) ring".
Laying Telford paving in Aspinwall, Pennsylvania in 1908
Laying Telford paving in Aspinwall, Pennsylvania in 1908
John Loudon McAdam
John Loudon McAdam
A macadam road in Nicolaus, California, c. 1850s
A macadam road in Nicolaus, California, c. 1850s
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John Loudon McAdam, 1830, National Gallery, London
John Loudon McAdam, 1830, National Gallery, London
Memorial stone to John Loudon McAdam
Memorial stone to John Loudon McAdam