John Wesley Powell Collection
 
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1 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.gr_jwpcText
2 Scientific American Supplement, No. 118, April 6, 1878gr_jwpcText
3 Scientific American Supplement, Vol V, No. 121gr_jwpcText
4 Scientific American Supplement, Vol. V, No. 124gr_jwpcText
5 Scientific American Supplement, Vol. VI, No. 131.gr_jwpcText
6 Scientific American Supplement, Vol. VI., No. 135gr_jwpcText
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