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  1. By: Köhler, Wolfgang,
    Edition: 2. durchgesehene Aufl. der "Intelligenzprüfungen an Anthropoiden I."
    Publication info: Berlin, J. Springer, 1921
    Holding Institution: American Museum of Natural History Library
  2. By: Köhler, Wolfgang,
    Publication info: London, Routledge and Kegan Paul, 1973
    Holding Institution: Internet Archive