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  1. Die natürliche wagerechte Richtung von Pflanzentheilen.
    By: Frank, Albert Bernhard.
    Publication info: Leipzig :Hermann Weissbach,1870.
    Contributed by: Cambridge University Library
    BHL Collections: Charles Darwin's Library
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  2. Die natürliche wagerechte Richtung von Pflanzentheilen. : [Supplementary material in Charles Darwin's copy].
    By: Darwin, Charles, - Frank, Albert Bernhard.
    Contributed by: Cambridge University Library
    BHL Collections: Charles Darwin's Library
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