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Biologische Untersuchungen TAF. XI . GUSTAF RKTZIUS ber den Bau des Eies der Echinodermen atp bbs mt Taf XI ' ' Gez Ret Repr und Druck von Cederquists Graf Sthl TAF XI Illustration XV biodiversitylibrary org title Frst Carl Magnus Retzius Gustaf Stach Wilhelm Biodiversity Heritage Library Biologische Untersuchungen