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Beitrag zur Kenntniss der Organischen Ueberreste des Kupfersamdsteins am Westlichen Abhange des Urals BHL. Beitrag zur Kenntniss der Organischen Ueberreste des Kupfersamdsteins am Westlichen Abhange des Urals Illustration Blank biodiversitylibrary org title Kutorga Not in copyright Biodiversity Heritage Library PDold Beitrag