xv, 397 pp. Illustrated from photographs throughout; folding map in the back. 8¾x5¾, original green cloth, lettered in gilt. First Edition.

Published only twenty-five years after the famous 1870 exploration party, led by Henry D. Washburn, surveyor-general of the Montana territory. The Washburn party is credited with "discovering" Yellowstone Park. Related period printed advertisement leaf from the Northern Pacific Railroad, laid down on the rear pastedown.