61A. Parts Of Southwestern Colorado.

Parts Of Southwestern Colorado. Atlas Sheet 61A. Weyss, Nell & Rock, Del. Expedition of 1877 Under the Command of 1st. Lieut. Geo. M. Wheeler, Corps of Engineers, U.S.A. Executive Officer & Field Astronomer: 1st. Lieut. Eric Bergland, Corps of Engineers. Louis Nell, Topographical Assistant. U.S. Geographical Surveys West Of The 100th Meridian.

Wheeler, G.M.

1877

1876

U.S.

1:253 440

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