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Keywords: Walcott Cambrian Geology and Paleontology II text figure 04.jpg Text figure 4 Charles D Walcott Middle Cambrian Holothurians and Medusae Smithsonian Miscellaneous Collections Volume 57 Number 3 Publication 2011 City of Washington Published by the Smithsonian Institution June 13 1911 1911 Creator Charles Doolittle Walcott PD-old-80 Walcott Cambrian Geology and Paleontology II |