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  1. Phosphatic microfossils from the Ordovician of the United States / Matthew H. Nitecki --, Raymond C. Gutschick --, John E. Repetski --.
    By: Nitecki, Matthew H. - Gutschick, Raymond C. - Repetski, John E.,
    Publication info: Chicago :Field Museum of Natural History,1975.
    Contributed by: University of Illinois Urbana Champaign
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