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  1. Permo-Carboniferous fresh water burrows / Everett C. Olson -- and Kathryn Bolles --.
    By: Olson, Everett Claire, - Bolles, Kathryn,
    Publication info: Chicago :Field Museum of Natural History,1975.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Amphibians, Fossil  Burrowing animals, Fossil  Carboniferous  Lung-fishes, Fossil  Paleontology  Permian  Sedimentary structures  United States  
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