4to. Frontispiece, numerous wood-engraved illustrations, many full-page, 2 folding maps in rear pocket. (Light spotting.) Contemporary calf, red and black morocco lettering-pieces gilt in 2 compartments (rubbing to extremities, 3-inch split to front joint at foot).

FIRST EDITION of Powell's report containing a description of the first documented voyage down the Colorado River, which covered 1,000 miles in just three months. Considered to be one of the "basic documents of Colorado River history." (Farquhar, 42.a). Graff 3336; Howes P-528; Monk p.180; Wheat 1261; Arizona 100 No. 76.