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Amsden, Thomas W. Notes on Parmorthis brownsportensis and Isorthis arcuaria from the Henryhouse and Brownsport formations. Thomas W.Amsden. In Oklahoma Geology Notes, 1956, vol.16, no.1. Norman : Oklahoma Geological Survey, 1956, Oklahoma Geology Notes, 1956, vol.16, no.1.S.78-85, : .
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