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Reference
Haeckel, Ernst: Systematische Phylogenie : Entwurf einer systematischen Stammesgeschichte : . Systematische Phylogenie der Protisten und Pflanzen / von Ernst Haeckel. Berlin. Berlin : Verlag von Georg Reimer, 1894. ETH-Bibliothek Zürich, Rar 14839: 1, https://doi.org/10.3931/e-rara-72554 / Public Domain Mark
