| Registros del 1 al 4 de 4 encontrados |
1.- Cambrian Brachiopoda
Walcott, Charles D.
Washington: Government Printing Office, 1912
United States Geological Survey. Monographs
MUSEO
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2.- Map of Alaska showing known gold bearing rocks
Walcott, Charles D.
Washington: United States Geological Survey, 1898
C 298 - 10
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3.- Ozarkian brachipods from Novaya Zemlya
Walcott, Charles D.
Kristiania: A.W. Broggers, 1924
C 280 - 16
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4.- Paleozoic intra - formational conglomerates
Walcott, Charles D.
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