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Beitrge zur Kenntniss der Gattung Najas Taf. III BHL. Beitrge zur Kenntniss der Gattung Najas Taf III Illustration biodiversitylibrary org Magnus Not in copyright Biodiversity Heritage Library PDold Beitrge zur Kenntniss der Gattung Najas Images uploaded by Files from the Biodiversity Heritage Library Biodiversity Heritage Library