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  1. Organic buildups in the Lower Ordovician (Canadian) of Texas and Oklahoma / Donald Francis Toomey -- and Matthew H. Nitecki --.
    By: Toomey, Donald F. - Nitecki, Matthew H. - Field Museum of Natural History.
    Publication info: [Chicago] :Field Museum of Natural History,1979.
    Contributed by: University of Illinois Urbana Champaign
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