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	1.	No cover image available Search of high-calcium limestone in Silurian reefs of northern Indiana by Ault, Curtis Carr, Donald 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. 641-647: : carte, tab., rés.(Angl) Availability: No items available.
	2.	No cover image available Introduction : symposium on industrial minerals of the upper Midwest discussion and reply by Norton, James Carr, Donald Murray, Haydn Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 94(4), 1983, p. 557-559: : tab. Availability: No items available.

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