This historical and colorful map details the state of the various surveys in progress. A color code at bottom shows the index area for atlas maps, the atlas maps (here called sheets) published, maps under preparation, and the area of Clarence King's explorations of the 40th parallel. The map is a remarkable and attractive work with a detailed representation of the various routes of western expeditions and the historic surveys of King, Wheeler, Powell & Hayden. Among the details are the locations of occupied and abandoned posts, signal service stations, telegraphic lines, routes of cattle droves and trains, and more information on explorer's routes than we've seen on any other map. The map reflects the survey efforts during the seasons of 1869 to 1878. Published in Lieut. George M. Wheeler's Annual Report under the direction of Brig. Gen. A.A. Humphreys, Chief of Engineers.

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Condition: A+

Folding as issued. Very nice printed color with full original margins. Two tiny spots, still fine.