4to. Frontispiece, numerous illustrations, 2 folding maps in rear pocket (numerous tape repairs to edges of both maps). Original cloth (some rubbing and soiling, spine slightly sunned, evidence of restoration at spine). Provenance: J.J. Wheeler (ownership blind stamp).

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 P528; Monk p180; Wheat 1261; Arizona 100 No. 76.