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	1.	No cover image available Coal resources and reserves estimates : some unresolved problems by Palmer, James Coal geology symposium: The evaluation of North American coal resources ( Nov. 1979) Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 92(8), part I, 1981, p. 519 Availability: No items available.
	2.	No cover image available Historical review of and current progress in coal-resource estimation in the United States by Wood, Gordon Jr Coal geology symposium: The evaluation of North American coal resources ( Nov. 1979) Material type: Article; Format: print Language: Eng In: Geological Society of America bulletin 92(8), part I, 1981, p. 520-528: : carte, graph., rés.(Angl) Availability: No items available.

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