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Walcott, Charles D. (Charles Doolittle), 1850-1927

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Eighteenth annual report of the United States Geological Survey to the Secretary of the Interior 1896-97
Eighteenth annual report of the United States Geological Survey to the Secretary of the Interior 1896-97

Twenty-seventh annual report of the United States Geological Survey
Twenty-seventh annual report of the United States Geological Survey

Twenty-fifth Annual report of the Director of the United States Geological Survey to the Secretary of the Interior 1903-4
Twenty-fifth Annual report of the Director of the United States Geological Survey to the Secretary of the Interior 1903-4