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  1. 1
    The fauna of the Pottsville formation of Ohio below the Lower Mercer limestone /
    by Morningstar, Helen, 1891-
    Published 1922
    Thesis Book
  2. 2
    Zonation of platform conodont genera in Conemaugh strata of Ohio and vicinity /
    by Merrill, Glen K.
    Published 1964
    Thesis Book
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