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  1. By: Clark, Eugenie, - Kamrin, Robert Paul,
    Publication info: New York, American Museum of Natural History, [1951]
    Holding Institution: American Museum of Natural History Library
    Subjects: 59.7,55P:11,613  Anatomy  Fins (Anatomy)  Fishes  Guppies  Poeciliidae  Reproduction  Sexual behavior in animals  Xiphophorus  
  2. By: Rosen, Donn Eric, - Kallman, Klaus D.
    Publication info: New York, N.Y American Museum of Natural History [1969]
    Holding Institution: American Museum of Natural History Library
    Subjects: Alta Verapaz  Central America  Classification  Fishes  Guatemala  Mexico  Xiphophorus  Xiphophorus helleri signum  
  3. By: Rauchenberger, Mary. - Kallman, Klaus D. - Morizot, Donald C.
    Publication info: New York, N.Y, American Museum of Natural History, c1990
    Holding Institution: American Museum of Natural History Library
    Subjects: Fishes  Mexico  Panuco River Basin  Xiphophorus  
  4. By: Kallman, Klaus D.
    Publication info: New York, NY American Museum of Natural History c2004
    Holding Institution: American Museum of Natural History Library
    Subjects: Classification  Coatzacoalcos River Valley  Fishes  Geographical distribution  Mexico  Phylogeny  Tehuantepec, Isthmus of  Xiphophorus  Xiphophorus mixei  Xiphophorus monticolus