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  1. Procolpochelys grandaeva (Leidy) : an early carettine sea turtle / by Rainer Zangerl and William D. Turnbull.
    By: Zangerl, Rainer. - Turnbull, William D.
    Publication info: Chicago, Ill. :Chicago Natural History Museum,1955.
    Contributed by: University of Illinois Urbana Champaign
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