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  1. By: Kolkwitz, R. (Richard),
    Publication info: Jena, G. Fischer, 1922
    Holding Institution: University of California Libraries
  2. By: Kolkwitz, R. (Richard),
    Publication info: Jena, G. Fischer, 1914
    Holding Institution: MBLWHOI Library
  3. By: Kolkwitz, R. (Richard), - Krieger, Hans
    Publication info: Leipzig : Akademische Verlagsgesellschaft Becker & Erler Kom.-Ges.), 1941-1944
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid