Map of Yosemite Valley, Yosemite National Park, California, Mariposa County / U.S. Geological Survey ; State of California ; E.M. Douglas, geographer ; R.B. Marshall, in charge of section ; topography by F.E. Matthes ; triangulation by C.F. Urquhart.Geological Survey (U.S.)[1918]"Surveyed in 1905-1906 in cooperation with the State of California."At head of title: Department of the Interior.Contour interval 50 feet. Datum is mean sea level.Includes location map and table of "Elevations of principal points."Relief shown by contours and spot heights.cartographic