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  1. By: Ricken, Adalbert
    Publication info: Leipzig : Verlag von Theodor Oswald Weigel, 1915
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid
  2. By: Ricken, Adalbert
    Publication info: Leipzig : Verlag von Theodor Oswald Weigel, 1915
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid