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  1. Chimpanzee intelligence and its vocal expressions, by Robert M. Yerkes and Blanche W. Learned.
    By: Yerkes, Robert Mearns, - Learned, Blanche W.
    Publication info: Baltimore,The Williams & Wilkins Company,1925.
    Contributed by: MBLWHOI Library
    BHL Collections: MBLWHOI Library, Woods Hole
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