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  1. By: Appel, Otto,
    Publication info: Berlin : Verlagsbuchhandlung Paul Parey ; Julius Springer, 1910
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid
  2. By: Knuth, Paul, - Appel, Otto, - Loew, Ernst, - Müller, Hermann,
    Publication info: Leipzig, W. Engelmann, 1898-1905
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  3. By: Appel, Otto, - Graebner, Paul, - Reh, L. - Sorauer, Paul,
    Publication info: Berlin, P. Parey, 1909-
    Holding Institution: NCSU Libraries
  4. By: Silva Tarouca, Ernst Emanuel, Graf, - Appel, Otto, - Schneider, Camillo,
    Edition: 2., neudurchgesehene und verm. Aufl.
    Publication info: Wien, Hölder-Pichler-Tempsky, 1923 [c1922]
    Holding Institution: NCSU Libraries
  1. By: Appel, Otto,
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 2
    Date: 1915
    Page Range: 275--285
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-