Charles Doolittle Walcott (1850-1927), fourth Secretary of the Smithsonian (1907-1927), was a paleontologist whose research focused on North American Cambrian fossils. He conducted field work in the ...
Charles Doolittle Walcott (1850-1927), fourth Secretary of the Smithsonian (1907-1927), was a paleontologist whose research focused on North American Cambrian fossils. He conducted field work in the ...
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