Topographical map of Lake Tahoe Region : Sierra Nevada, California and Nevada / U.S. Geographical Surveys West of the 100th Meridian.Geographical Surveys West of the 100th Meridian (U.S.)1881"Expeditions of 1876 & 1877 under the command of 1st Lieut. Geo. M. Wheeler, Corps of Engineers, U.S. Army.""Reduced by heliogravure ... from original on scale of 1 inch to 1 mile."Relief shown by hachures and spot heights.Shows drainage, roads, railroads, etc.cartographic