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Weller J.M. (1929). On some of Gurley's unfigured species of Carboniferous Bellerophon. Transactions of the Illinois State Academy of Science. 21: 313-325.
Weller J.M. (1929). On some of Gurley's unfigured species of Carboniferous Bellerophon. Transactions of the Illinois State Academy of Science. 21: 313-325.