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Amsden, Thomas W. Coelospira concava (Hall) from the Pinetop Chert (Early Devonian), Ouachita Mountains, Oklahoma. Thomas W.Amsden. In Journal of Paleontology, 1983, vol.57, no.6. Tulsa : Society of Economic Paleontologists and Mineralogists, 1983, Journal of Paleontology, 1983, vol.57, no.6.S.1244-1260, : .
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