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  1. By: Sass, Arthur, Baron von.
    Publication info: Dorpat, Druck von H. Laakmann, 1860
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Estonia  Plants  Ruhnu  Saaremaa Island
  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