– The First Occurrence of Vertebrates, Represented by the Paleozoic Sharks, Petrodus, Listacanthus, Cladodus and Cranodus(?) from the Pennsylvanian-Permian Minnelusa Formation near Piedmont, South Dakota Author(s): Randy A. Elder Year: 1993 Volume: 72 Pages: 221-233 | South Dakota Academy of Science

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