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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1993.
I 28.27: 9355 |
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4.
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Lexington : Kentucky Geological Survey, 1982.
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Coal resources of the Southwestern District, Kentucky : Bell, Clay, Clinton, Estill, Jackson, Knox, Laurel, Lee, Madison, McCreary, Owsley, Pulas[...]
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Washington : U.S. Govt. Print. Off., 1958.
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7.
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[Knoxville? Tenn.] : Tennessee Valley Authority, 1963.
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