National Portrait Gallery (United States)
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Charles Doolittle Walcott
1927 in science
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Charles Walcott
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1909 in science
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Charles Greeley Abbot
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Wollaston Medal
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1850 in science
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Timeline of paleontology
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Emmonsaspis
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List of people from New York (state)
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John Wesley Powell
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Robert H. Goddard
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Yoho National Park
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Amiskwia
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National Advisory Committee for Aeronautics
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Nectocaris
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Aysheaia
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Sanctacaris
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Marrella
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Opabinia
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New York Mills, New York
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Samuel Langley
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List of geologists
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Charles
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Smithsonian Institution
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Hallucigenia
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National Academy of Sciences
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Telluride, Colorado
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Hyolitha
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1927
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1850
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Naraoiidae
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Louis Agassiz
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Burgess Shale
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August 30
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C. D. Walcott
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