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By: Grabau, Amadeus W. (Amadeus William), - Berkey, Charles Peter, - Morris, Frederick K., - Central Asiatic ExpeditionsEdition: 1st ed.Publication info: New York, American Museum of Natural History, 1931Volume:Series:Holding Institution: American Museum of Natural History LibrarySubjects: 5.083(51.7) 56.2(115:51.7) Geology Geology, Stratigraphic Mongolia Paleontology PermianBHL Collections: