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River mussel or unio sp., vintage engraving. River mussel or unio sp., vintage engraved illustration. dictionary of words and | CanStock
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European freshwater mussels (Unio spp., Unionidae) in Siberia and Kazakhstan: Pleistocene relicts or recent invaders? - ScienceDirect
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River Mussel or Unio sp., vintage engraved illustration. Dictionary of Words and Things - Larive and Fleury - 1895 Stock Vector Image & Art - Alamy
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