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By: Schaeffer, Bobb, - Dunkle, David H. - McDonald, Nicholas G.Edition:Publication info: Chicago, Field Museum of Natural History, 1975Volume: v.33:no.12 (1975)Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects: Northeastern States Paleontology Ptycholepis marshi Triassic VirginiaBHL Collections: