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	1.	No cover image available North american commission on stratigraphic nomenclature : Report 8 - Amendment of code concerning terminology for igneous and high-grade metamorphic rocks by Henderson, John Caldwell, W. G Harrison, Jack Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 91(6), part I, 1980, p. 374-376 Availability: No items available.
	2.	No cover image available North american commission on stratigraphic nomenclature : Note 52 - A preliminary proposal for a chronometric time scale for the precambrian of the United States and Mexico by Harrison, Jack Peterman, Zell Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 91(6), part I, 1980, p. 377-380: : tab. Availability: No items available.

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