61C. S.W. Colorado, San Juan Mining Region.

S.W. Colorado, San Juan Mining Region. Atlas Sheet 61 (C.). Louis Nell, Del. Expeditions of 1874 and 1875 under the Command of 1st. Lieut. Geo. M. Wheeler, Corps of Engineers, U.S. Army. Executive Officer and Field Astronomer: 1st. Lieut. W.L. Marshall, Corps of Engineers, U.S. Army. Topographical Assistants: Louis Nell and J.C. Spiller. U.S. Geographical Surveys West Of The 100th Meridian (1876?)

Wheeler, G.M.

1876

1876

U.S.

1:126 720

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