USBM IC 8531
Title:Strippable reserves of bituminous coal and lignite in the United States
Authors:Staff, U.S. Bureau of Mines
Publisher:U.S. Bureau of Mines
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Staff, U.S. Bureau of Mines, 1971, Strippable reserves of bituminous coal and lignite in the United States: U.S. Bureau of Mines Information Circular 8531, 22 p.
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