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  1. Ptycholepis marshi Newberry : a chondrostean fish from the Newark group of Eastern North America / Bobb Schaeffer --, David H. Dunkle --, Nicholas G. McDonald --.
    By: Schaeffer, Bobb, - Dunkle, David Hosbrook - McDonald, Nicholas G.
    Publication info: Chicago :Field Museum of Natural History,1975.
    Contributed by: University of Illinois Urbana Champaign
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