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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Olson, Everett Claire, - Bolles, Kathryn.
    Publication info: Chicago, Field Museum of Natural History, 1975
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Amphibians, Fossil  Burrowing animals, Fossil  Carboniferous  Lung-fishes, Fossil  Paleontology  Permian  Sedimentary structures  United States