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  1. By: Krieger, Willi
    Publication info: Leipzig : Akademische Verlagsgesellschaft M. B. H. (Druck von Paul Dünnhaupt, Köthen (Anhalt)), 1933-1937
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid
  2. By: Krieger, Willi
    Publication info: [Leipzig : Akademische Verlagsgesellschaft M. B. H.], 1939
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid