A remarkable and attractive map that reflects the survey efforts in the West. It is a detailed representation of the various routes of western expeditions and the important surveys of King (40th parallel), Wheeler, Powell & Hayden. This edition includes the survey seasons of 1869, and 1871 through 1874. Among the details are the locations of occupied and abandoned posts, astronomical stations, signal service stations, telegraphic lines, and the routes of cattle droves and trains. The map is a virtual tour de force of prior explorations and surveys with more information than we've seen on any other map. It was published in Lieut. George M. Wheeler's Annual Report under the direction of Brig. Gen. A.A. Humphreys, Chief of Engineers, in which this map is still bound. The report is "Appendix LL. Annual Report of Lieutenant George M. Wheeler, Corps of Engineers, for the Fiscal Year Ending June 30, 1875. Geographical Explorations and Surveys West of the One Hundredth Meridian, in California, Nevada, Nebraska, Utah, Arizona, Colorado, New Mexico, Wyoming, and Montana." The disbound report, composed of pages 921 - 1110, contains 29 in-text figures, 9 lithographic plates (views, fossil specimens, and Indian ruins, some tinted), and two folding maps. The second map is Preliminary Sketch Showing the condition of Determinations made at Main or Initial Astronomical Stations Measured Bases and at Main Triangulation Stations in the Colorado Section of Geographical Surveys West of the 100th Meridian, (14.3 x 20.7").

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Condition: A+

The progress map is fine. Contents and other plates and map are similar.