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  1. Pennsylvanian invertebrates of the Mazon Creek Area, Illinois: the morphology and affinities of Tullimonstrum / Ralph Gordon Johnson -- and Eugene S. Richardson, Jr. --
    By: Johnson, Ralph Gordon, - Richardson, Eugene Stanley,
    Publication info: [Chicago] :Field Museum of Natural History ,1969.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Illinois  Paleontology  Pennsylvanian  Tullimonstrum  
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