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  1. The play of animals, by Karl Groos. Tr. with the author's cooperation by Elizabeth L. Baldwin; with a preface and an appendix by J. Mark Baldwin.
    By: Groos, Karl, - Baldwin, Elizabeth L. - Baldwin, James Mark,
    Publication info: New York,D. Appleton[1898]
    Contributed by: NCSU Libraries (archive.org)
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