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Archiv für Naturgeschichte Abteilung A (Nicolai, 1915)

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Botanischer Jahresbericht - Just, Johann Leopold, 1841 -1891 (Gebr. Borntraeger, 1880)

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Checklist of CITES Species: a reference to the appendices to the Convention on International Trade in Endangered Species of Wild Fauna and Flora (2001)

Checklist of CITES Species: a reference to the appendices to the Convention on International Trade in Endangered Species of Wild Fauna and Flora (1996)

Flora of tropical Africa - Oliver, Daniel, 1830 -1916 (L. Reeve and co, 1897)

Flora of tropical Africa - Oliver, Daniel, 1830 -1916 (L. Reeve and co, 1897)

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The Journal of the Linnean Society. Botany - Linnean Society of London. (Longman, Green, Longman, Roberts & Green, 1881)

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Das Tierreich - Deutsche Zoologische Gesellschaft. (R. Friedländer, 1899)