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  1. By: Wirtgen, Philipp Wilhelm,
    Publication info: Bonn, A. Henry, 1870
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  2. By: Wirtgen, Philipp Wilhelm,
    Edition: 3., verb. und verm. Aufl.
    Publication info: Coblenz, T. Hölscher, 1852
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  3. By: Wirtgen, Philipp Wilhelm,
    Publication info: Bonn, Henry & Cohen, 1842
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library