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  1. A forest of the coal age / by B. E. Dahlgren, Acting Curator, Dept. of Botany.
    By: Dahlgren, B. E. - Field Museum of Natural History.
    Publication info: Chicago :Field Museum Press,1933.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Bossen  Carboniferous  Carboon  Paleobotany  Petrified forests  
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