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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hallez, Paul.
    Edition: 2e éd. augm. et entièrement remaniée.
    Publication info: Lille, Impr. L. Danel, 1894
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: France  Platyhelminthes  Polycladida  Rhabdocoelida  Tricladida  
  2. By: Hyman, Libbie Henrietta,
    Publication info: New York, N.Y American Museum of Natural History [1960]
    Holding Institution: American Museum of Natural History Library
    Subjects: 59.51.23U  Classification  Echinodermata  Parasites  Rhabdocoelida  Umagillidae
  3. By: Graff, Ludwig von,
    Publication info: Strassburg, F. Wolff, 1873
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    Subjects: Rhabdocoelida