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By: Walcott, Charles D. (Charles Doolittle),Edition:Publication info: 1882-1883Volume:Series:Holding Institution: Smithsonian Institution ArchivesSubjects: Arizona Chuar Valley Colorado River Field notes Geology Geology, Stratigraphic--Carboniferous Geology, Stratigraphic--Devonian Geology, Stratigraphic--Proterozoic Illustrations Paleontology United States Unkar CreekBHL Collections: Smithsonian Field Books collection