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Amsden, Thomas W. Late Ordovician Through Early Devonian Annotated Correlation Chart and Brachiopod Range Charts for the Southern Midcontinent Region, USA, with a discussion of Silurian and Devonian Conodont Faunas. :. Thomas W.Amsden, James E.Barrick. In Bulletin. Norman : University of Oklahoma, 1988, Bulletin. 66s., : .Oklahoma Geological Survey, 1988, 143.
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