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	1.	No cover image available Origin and tectonic setting of Ordovician bentonites in North America : isotopic and age constraints by Samson, Scott Patchett, Jonathan Roddick, Chris Parrish, Randall Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 101(9), 1989, p. 1175-1181: : ill., carte, graph., tab., rés.(Angl) Availability: No items available.
	2.	No cover image available Origin and tectonic setting of Ordovician bentonites in North America : isotopic and age constraints discussion and reply by Haynes, John Huff, Warren Samson, Scott Patchett, P. Jonathan Roddick, J. Chris Parrish, R. Randall Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 102(10), 1990, p. 1439-1441: : ill. Availability: No items available.

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