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Sketch of Pioche, Nevada showing position of astronomical monument and meridian marks. Sketch of Virginia City, Nevada showing position of astronomical monument. Sketch of Hughes, Colorado showing position of astronomical monument and meridian mark. Sketch of Colorado Springs, Colorado showing position of astronomical monument. Sketch of Labran, Colorado showing position of astronomical monument and meridian mark. Sketch of Trinidad, Colorado showing position of astronomical monument. Expeditions of 1872, 1873, 1874, 1875 & 1876, under the command of 1st Lieut. Geo. M. Wheeler, Corps of Engineers, U.S. Army. U.S. Geographical Surveys West of the 100th Meridian. George D. Clarke, del. The Graphic Co., N.Y. By order of the honorable the Secretary of War, under the direction of Brig. Gen. A.A. Humphreys, Chief of Engineers, U.S. Army. (1877)
who: Wheeler, G.M.; United States. Army. Corps of Engineers; U.S.; Clarke, George D.; Graphic Co. Photo-Lith.
what: Exploration Book; Atlas Map
when: 1877
where: Pioche (Nev.); Virginia City (Nev.); Nevada; Colorado
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