Topographical map of Washoe mining region / U.S. Geological Surveys West of the 100th Meridian ; Lieut. T.W. Symons, Dr. F. Kampf, field astronomy & triangulation ; Anton Karl, field topography.Geographical Surveys West of the 100th Meridian (U.S.)[1877]"Expeditions of 1876 & 1877, under the command of 1st. Lieut. Geo. M. Wheeler, Corps of Engineers, U.S. Army."Centers on Virginia City area.Relief shown by contours, hachures, and spot heights.cartographic