Southwestern Colorado, Atlas Sheet 61 C. J.C. Spiller, Del. Expeditions of 1874-1875, 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: 1874 Louis Nell, 1875 J.C. Spiller. U.S. Geographical Surveys West Of The 100th Meridian.
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Southwestern Colorado, Atlas Sheet 61 C. J.C. Spiller, Del. Expeditions of 1874-1875, 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: 1874 Louis Nell, 1875 J.C. Spiller. U.S. Geographical Surveys West Of The 100th Meridian.
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