Walcott, Charles Doolittle, 1912, Cambrian geology and paleontology II: Middle Cambrian Branchiopoda, Malacostraca, Trilobita and Merostomata

Walcott, Charles Doolittle, 1912, Cambrian geology and paleontology II: Middle Cambrian Branchiopoda, Malacostraca, Trilobita and Merostomata, Smithsonian Miscellaneous Collections 57, pp. 145-228

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