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  1. By: Drude, Oscar,
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
  2. By: Drude, Oscar,
    Publication info: Leipzig :W. Engelmann,1902.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  3. By: Engler, Adolf, - Drude, Oscar,
    Publication info: Leipzig :W. Engelmann,1896-1928.
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
  1. By: Drude, Oscar,
    Type: Correspondence
    In: Asa Gray correspondence.
    Date: 1888-12-02
    Publication info: [1831-1895]
  2. By: Drude, Oscar,
    Type: Correspondence
    In: Asa Gray correspondence.
    Date: 1883-09-16
    Publication info: [1831-1895]