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Smithsonian Institution Secretary, Charles Doolittle Walcott - Ellis Yochelson

Charles Doolittle Walcott (1850-1927) is a highly respected figure in history of geology and paleontology. Perhaps his most notable contribution to his field was his discovery of the Middle Cambrian B...

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Smithsonian Institution Secretary, Charles Doolittle Walcott - Ellis Yochelson

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