Report of the explorations in 1873 of the Colorado of the West and its tributaries, [electronic resource]/ by Professor J. W. Powell, under the direction of the Smithsonian institution.
Also issued as House misc, doc. 265, 43d Cong., 1st sess. (Washington, 1874) under title: Professor Powell's report ...
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Electronic text and image data. Ann Arbor, Mich. : University of Michigan, Digital Library Initiatives, 1996. Includes both TIFF files and keyword searchable text. [Making of America] This volume is made possible by a grant from the Andrew W. Mellon Foundation.