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Ebbestad, J. O. R.; Yochelson, E. L. (2000). Isostrophic molluscs (Tergomya and Gastropoda) from the Upper Ordovician of Norway. Norsk Geologisk Tidsskrift. 80(3): 187-202.
Ebbestad, J. O. R.; Yochelson, E. L. (2000). Isostrophic molluscs (Tergomya and Gastropoda) from the Upper Ordovician of Norway. Norsk Geologisk Tidsskrift. 80(3): 187-202.
