A detailed map that reflects the survey efforts in the West, covering the seasons of 1869 and 1871-75. It presents the various routes of western expeditions and the surveys of King (40th parallel), Wheeler, Whipple, Ruffner, and many others. Among the many details are the locations of occupied and abandoned posts, astronomical stations, 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 faint toning along the folds, a bit of offsetting, and a narrow right margin due to binding. There is a small chip in the top right blank margin.