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  1. By: Dickerson, Mary Cynthia,
    Publication info: New York, Doubleday, Page & Co, 1908, ©1906
    Holding Institution: Internet Archive
    Subjects: Frogs  Kikkers  North America  Padden  Toads
  2. By: Schmidt, Karl Patterson, - Field Museum of Natural History.
    Publication info: Chicago, Field Museum of Natural History, 1929
    Holding Institution: Field Museum of Natural History Library
    Subjects: Chicago  Frogs  Illinois  Kikkers  Padden  Toads