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By: Walcott, Charles D. (Charles Doolittle), - Resser, Charles Elmer,Edition:Publication info: 1900-1929Volume:Series:Holding Institution: Smithsonian Institution ArchivesSubjects: Black-and-white photographs Field notes Geology Geology, Stratigraphic--Cambrian Montana Pale Creek Paleontology Swan Range Tobacco Root Mountains United StatesBHL Collections: Smithsonian Field Books collection