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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.
Holding Institution: University Library, University of Illinois Urbana Champaign
Subjects: Illinois Paleontology Pennsylvanian Tullimonstrum