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	1.	No cover image available New maps of Federal coal by Wayland, Russell 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. 542-550: : ill., tab., rés.(Angl) Availability: No items available.
	2.	No cover image available Geologic problems associated with coal resources and reserves determination in the Appalachian Coal Basin by Brant, Russell 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. 551-557: : carte, rés.(Angl) Availability: No items available.

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