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Mittheilungen aus der Zoologischen Station zu Neapal - Stazione zoologica di Napoli. (Wilhelm Engelmann, 1899)

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Morphologie und Biologie der Algen - Oltmanns, Friedrich, 1860 -1945 (G. Fischer, 1922)

Morphologie und biologie der algen - Oltmanns, Friedrich, 1860 -1945 (G. Fischer, 1905)