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	1.	No cover image available Provenance of Franciscan graywackes in coastal California by Dichinson, William Ingersoll, Raymond Cowan, Darrel Helmold, Kenneth Suczek, Christopher Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 93(2), 1982, p. 95-107: : ill., carte, graph., tab., rés.(Angl) Availability: No items available.
	2.	No cover image available Early Proterozoic metasediments from north-central Colorado : metamorphism, provenance, and tectonic setting discussion and reply by Ingersoll, Raymond Suczek, Christopher Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 95(8), 1984, p. 985-986 Availability: No items available.

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