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	1.	No cover image available Nd isotopes and the origin of 1.9-1.7 Ga Penokean continental crust of the Lake Superior region by Barovich, Karin Patchett, Johathan Peterman, Zell Sims, Paul Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 101(3), 1989, p. 333-338: : carte, graph., tab., rés.(Angl) Availability: No items available.
	2.	No cover image available The U.S : midcontinent a new frontier for mineral exploration by Pratt, Walden Sims, Paul Material type: Article; Format: print Language: Eng In: Episodes 10(4), 1987, p. 303-307: : ill., carte Availability: No items available.

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