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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hawkins, Herbert Leader,
    Publication info: London, Methuen & co. ltd, [1920]
    Holding Institution: University of California Libraries
  2. By: Arnold, Benjamin Walworth, - Clark, Hubert Lyman, - Hawkins, Herbert Leader,
    Publication info: Cambridge, U.S.A, Printed for the Museum, 1927
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library