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  1. By: McGregor, Richard C. (Richard Crittenden),
    Publication info: Manila,1915.
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  2. By: McGregor, Richard C. (Richard Crittenden),
    Publication info: Manila,Bureau of Public Printing,1905.
    Holding Institution: University of California Libraries (archive.org)
  3. By: McGregor, Richard C. (Richard Crittenden),
    Publication info: Manila :Bureau of Printing,1909.
    Holding Institution: University of California Libraries (archive.org)
  4. By: McGregor, Richard C. (Richard Crittenden),
    Publication info: Manila :Bureau of Printing,1909.
    Holding Institution: American Museum of Natural History Library