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  1. By: Hansen, Emil Chr. (Emil Christian),
    Publication info: Copenhague, 1876
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  2. By: Hansen, Emil Chr. (Emil Christian), - Miller, Alexander Kenneth.
    Publication info: London, E. & F. N. Spon, 1896
    Holding Institution: University of California Libraries
  1. By: Hansen, Emil Chr. (Emil Christian),
    Type: Article
    In: Annals of botany
    Volume: 9
    Date: 1895-12
    Page Range: 549--560
    Publication Info: London, Academic Press [etc.],