-
By: Olson, Everett Claire, - Bolles, Kathryn.Edition:Publication info: Chicago, Field Museum of Natural History, 1975Volume: v.33:no.15 (1975)Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects: Amphibians, Fossil Burrowing animals, Fossil Carboniferous Lung-fishes, Fossil Paleontology Permian Sedimentary structures United StatesBHL Collections: