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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Dahlgren, B. E. (Bror Eric), - Field Museum of Natural History. Department of Geology.
    Publication info: Chicago, Field Museum Press, 1933
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Bossen  Carboniferous  Carboon  Paleobotany  Petrified forests