Exploration of the Colorado River of the West and its tributaries : explored in 1869, 1870, 1871, and 1872, under the direction of the Secretary of the Smithsonian Institution.

Washington : Government Printing Office, 1875.

xi, 291 pages, 81 unnumbered leaves of plates : illustrations, maps ; 30 cm

Map and profile in pocket.

J.W. Powell in charge.

The present report does not include a narrative of the second descent of the river in 1871-1872, a detailed account of which may be found in F.S. Dellenbaugh's A canyon voyage, New York, 1908.

Chapters 1-9 of pt. 1, with six chapters added, were published later (Meadville, Pa., 1895) under title: Canyons of the Colorado, by J.W. Powell.

Pt. 1. History of the explorations of the cañons of the Colorado [May 24-Sept. 20, 1869] Report on a trip to the mouth of the Dirty Devil River [May 27-July 11, 1872] by A.H. Thompson.--pt. 2. On the physical features of the valley of the Colorado.--pt. 3. Zoology: Abstracts of results of a study of the genera Geomys and Thomomys, by Elliott Coues. Addendum A. The cranial and dental characters of Geomydæ, by Elliott Coues. Addendum B. Notes on the salamander of Florida (Geomys Tueza) by G.B. Goode.