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The North American Continent During Cambrian Time (1892)
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Biographical Memoir Of Samuel Pierpont Langley, 1834-1906 (1912)
Pre-Cambrian Fossiliferous Formations (1899)
The Trilobite
Paleontology Of The Eureka District (1884)
Charles Doolittle Walcott, Paleontologist
Smithsonian Institution Secretary, Charles Doolittle Walcott