Part of south western Colorado [cartographic material] / U.S. Geographical Surveys West of the 100th Meridian.Geographical Surveys West of the 100th Meridian (U.S.)[1878]"Atlas sheet no. 61(D).""Expeditions of 1873, 74, 75 & 76 under the command of 1st. Lieut. Geo. M. Wheeler, Corps of Engineers, U.S. Army.""Issued Jan. 10th 1878.""Weyss, Lang & Herman, del."Relief shown by hachures and spot heights.cartographic