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	1.	No cover image available Geologic types of glass-sand deposits and some North American representatives by Heinrich, E. WM 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. 611-613: : rés.(Angl) Availability: No items available.
	2.	No cover image available High-extraction magnetic filtration : a new beneficiation process for industrial minerals by Murray, Haydn 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. 614-620: : ill., graph., tab., rés.(Angl) Availability: No items available.
	3.	No cover image available High-calcium, high-reflectance limestone resources of Illinois by Goodwin, Jonathan Baxter, James 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. 621-628: : ill., carte, tab., rés.(Angl) Availability: No items available.
	4.	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.
	5.	No cover image available Evaluation of high-purity limestones and dolostones in northern Michigan by Johnson, Allan Sorensen, Harry 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. 634-640: : carte, tab. Availability: No items available.
	6.	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.

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