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  1. By: Gertsch, Willis John, - Mulaik, Stanley - Mulaik, Dorothea
    Publication info: New York City, The American Museum of Natural History, [1939]
    Holding Institution: American Museum of Natural History Library
  2. By: Gertsch, Willis John, - Mulaik, Dorothea - Mulaik, Stanley
    Publication info: 1939
    Holding Institution: American Museum of Natural History Library