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  1. By: Koorders, S. H. (Sijfert Hendrik), - Valeton, Theodoric,
    Publication info: Lieden :Buch- und Steindruckerei,1913-18.
    Holding Institution: Harvard University Botany Libraries
  2. By: Koorders, S. H. (Sijfert Hendrik), - Valeton, Theodoric,
    Publication info: Batavia :G. Kolff & co.,1894-1914.
    Holding Institution: Harvard University Botany Libraries
  3. By: Koorders, S. H. (Sijfert Hendrik),
    Publication info: Batavia :G. Kolff,1894.
    Holding Institution: Harvard University Botany Libraries