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  1. By: Aiken, Charles Edward Howard, - Colorado College.
    Publication info: Colorado Springs :Published by the authority of the Board of Trustees of Colorado College,1914
    Holding Institution: Cornell University Library
  2. By: Aiken, Charles Edward Howard, - Brewster, William,
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    BHL Collections: William Brewster Papers