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Keywords: Walcott Cambrian Geology and Paleontology II table p156.jpg Stratigraphic Distribution of Earliest Representatives of Each of the Five Subclasses of the Crustacea Charles D Walcott Middle Cambrian Branchiopoda Malacostraca Trilobita and Merostomata Smithsonian Miscellaneous Collections Volume 57 Number 6 Publication 2051 City of Washington Published by the Smithsonian Institution March 13 1912 1912 Creator Charles Doolittle Walcott PD-old-80 Walcott Cambrian Geology and Paleontology II |