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Keywords from Image Description:
Johansen Fig Pisidium clessini. en Pisidium clessini inner side of left valve Extinct freshwater bivalve Danish Middle Pleistocene deposits Johansen Om den fossile kvartaere molluskfauna Danmark og dens relationer til forandringer klimaet Land og ferskvandsmolluskfaunaen Kbenhavn IIV Fig Johansen Scanned by Tom Meijer PDold