A remarkable and attractive map that reflects the survey efforts in the West, including the survey seasons of 1869, and 1871 through 1877. It is a detailed representation of the various routes of western expeditions and the important surveys of King (40th parallel), Wheeler, Powell and Hayden. 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 progress maps are among the most interesting, informative and useful maps of the West.

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Condition: B+

Issued folding with pleasant light toning and a short binding tear at left that extends 0.5" into the image.