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1

The exploration of the Colorado River,

The exploration of the Colorado River,

by Powell, John Wesley, 1834-1902
Published 1961

Book

2

A canyon voyage : the narrative of the second Powell expedition down the Green-Colorado River from Wyoming, and the explorations on land, in the years 1871 and 1872 /

A canyon voyage : the narrative of the second Powell expedition down the Green-Colorado River from Wyoming, and the explorations on land, in the years 1871 and 1872 /

by Dellenbaugh, Frederick Samuel, 1853-1935
Published 1962

Book