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  1. By: Hopson, James A.
    Publication info: Chicago, Field Museum of Natural History, 1974
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Anaspida  Fins (Anatomy)  Fishes  Locomotion
  2. By: Ritchie, Alexander,
    Publication info: New York, N.Y, American Museum of Natural History, c1980
    Holding Institution: American Museum of Natural History Library
    Subjects: Anaspida  Estonia  Fishes, Fossil  Norway  Paleontology  Rhyncholepis  Ringerike  Saaremaa Island  Silurian