Washington, D.C.: Government Printing Office, 1875. First edition. 4to. Frontispiece, numerous illustrations, 2 folding maps. Contemporary half morocco (recased). Graff 3336; Howes P528; Monk p.180; Wheat 1261; Arizona 100, No. 76.

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).

Together with:
Report on the Lands of the Arid Region of the United States, with a More Detailed Account of the Lands of Utah. Washington, D.C.: GPO, 1879. 4to. 3 folded colored maps at rear, numerous repairs to folds, and 2 additional maps in text. Original brown cloth (rebacked). Second edition.