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  1. The functional significance of the hypocercal tail and lateral fin fold of Anaspid ostracoderms / James A. Hopson --.
    By: Hopson, James A.
    Publication info: Chicago :Field Museum of Natural History,1974.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Anaspida  Fins (Anatomy)  Fishes  Locomotion  
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