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	1.	No cover image available Chemical composition, stratigraphy, and depositional environments of the Black River Group (middle Ordovician), southwestern Ohio by Stith, David Symposium on industrial minerals of the upper Midwest ( 10 april 1980 : Bloomington) Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 92(9), part I, 1981, p. 629-633: : carte, graph., tab., rés.(Angl) Availability: No items available.
	2.	No cover image available Megablocks of calcified algae in the Cow Head Breccia, western Newfoundland : vestiges of a Cambro-Ordovician platform margin by James, Noel Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 92(11), part I, 1981, p. 799-811: : ill., carte, rés.(Angl) Availability: No items available.
	3.	No cover image available Petrology and depositional history of a Middle Ordovician carbonate platform : Chickamauga Group, northeastern Tennessee by Ruppel, Stephen Walker, Kenneth Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 95(5), 1984, p. 568-583: : ill., tab., rés.(Angl) Availability: No items available.

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