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	1.	No cover image available Geological setting of U.S : fossil fuels by Masters, Charles Mast, Richard Material type: Article; Format: print Language: Eng In: Episodes 10(4), 1987, p. 308-313: : ill., carte Availability: No items available.
	2.	No cover image available World resources of natural gas - a discussion by Masters, Charles Series: U. S. Geological Survey Professional paper, 1570 Material type: Article; Format: print ; Literary form: Not fiction Language: Eng In: The future of energy gases p. 607-616 : carte, graph., tab. Availability: No items available.

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