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SMITHSONIAN MISCELLANEOUS COLLECTIONS
VOLUME 57, NUMBER 1
CAMBRIAN
GEOLOGY AND PALEONTOLOGY
II
ABRUPT APPEARANCE OF THE CAMBRIAN FAUNA ON THE NORTH AMERICAN CONTINENT
With One Map
BY
CHARLES D. WALCOTT
(Publication 1940)
CITY OF WASHINGTON
PUBLISHED BY THE SMITHSONIAN INSTITUTION
AUGUST 18, 1910
