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  1. By: Heyer, Gustav,
    Edition: 4. Aufl.
    Publication info: Leipzig, B.G. Teubner, 1892
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Heyer, Gustav,
    Publication info: Erlangen, F. Enke, 1852
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library