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  1. By: Hjelt, Otto E. A.
    Publication info: Jena, Gustav Fischer, 1909
    Holding Institution: Wellcome Library
  2. By: Hjelt, Otto E. A. - Royal College of Surgeons of England.
    Publication info: Leipzig, Wilhelm Engelmann, 1882
    Holding Institution: Wellcome Library
  3. By: Prytz, Lars Johan, - Hjelt, Otto E. A.
    Publication info: Helsingfors, 1869
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library