Ancestry of Modern Amphibia: A Review of the Evidence,Theodore H.
   Eaton� 37350
   � [Link: [1]http://www.gutenberg.org/3/7/3/5/37350 ]
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   Janet

References

   1. http://www.gutenberg.org/3/7/3/5/37350
   2. http://www.pgdp.net/