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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Colbert, Edwin H. - Falkenbach, Otto,
    Publication info: 1945
    Holding Institution: American Museum of Natural History Library
  2. By: Brown, Barnum, - Falkenbach, Otto, - Schlaikjer, Erich M.‏ (Erich Maren),‏
    Publication info: 1940
    Holding Institution: American Museum of Natural History Library