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  1. Check-list of North American Batrachia and Reptilia; with a systematic list of the higher groups, and an essay on geographical distribution. Based on the specimens contained in the U. S. National Museum. By Edward D. Cope.
    Publication info: Washington :Govt. print. off.,1875.
  2. Smithsonian miscellaneous collections.
    Publication info: Washington :Smithsonian Institution,1862-1972.