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Amsden, Thomas W. Articulate Brachiopods of the St.Clair Limestone (Silurian), Arkansas, and the Clarita Formation (Silurian), Oklahoma. Thomas W.Amsden. In Journal of Paleontology, 1968, vol.42, no.3. Tulsa : Paleontological Society, 1968, Journal of Paleontology, 1968, vol.42, no.3. 117s., : .Memoir 1.
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