Author: AMSDEN, TH.W. & J.E. BARRICK
Title: Late Ordovician-Early Silurian strata in the central United States and the Hirnantian stage.
Description: 1986. Oklahoma Geol. Surv. Bull. 139; 95 pp. 40 fig./phot. 7 photoplts. Orig. wrps. with libr. stamp, very good.

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