1879. Progress map of the Geographical Surveys west of the 100th Meridian : prepared under the direction of 1st Lieut. George M. Wheeler, Corps of Engineers U. S. Army in charge. In lower margin: By order of the honorable, the Secretary of War ... under the direction of Brig. Gen. A. A. Humphreys, Chief of Engineers, Army. "Seasons of 1869, 1871, 1872, 1873, 1874, 1875, 1876, 1877 & 1878."... , Western United States ,area

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