1926. Geological Survey (U.S.). Relief shown by contours and spot heights.; "Surveyed in 1924-5."; Vertical scale of profiles 1 in. = 40 ft.; Includes "Key map of plan sheets" on ... The Survey (Washington).
Search Results
1926. Geological Survey (U.S.). Relief shown by contours and spot heights.; Contour interval 50 feet.; Also shows status of roads.; "Surveyed in 1925-1926."; "N4022-W12115." 53 x ... The Survey (Washington, D.C).