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By: Colbert, Edwin H. - Waltz, Norman.Edition:Publication info: New York, N.Y, American Museum of Natural History, [1960]Volume: no. 2022Series:Holding Institution: American Museum of Natural History LibrarySubjects: 56.81,1S(1161:74.8) Lancaster County Paleontology Pennsylvania Reptiles, Fossil Sphodrosaurus pennsylvanicus TriassicBHL Collections: