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- Cobb, J.C., and Eble, C.F., 1992, Sulfur in Kentucky coal and the Clean Air Act amendments of 1990: Kentucky Geological Survey, Series 11, IC 38, 14 p.
- Davidson, R.M., 1996, Trace elements in coal: Center for Applied Energy Research, University of Kentucky, Energeia, v. 7, p. 1-5.
- Eble, C.F., 2000, Overview of environmental regulations that affect coal combustion: Kentucky Geological Survey, ser. 12, Information Circular 2, 6 p.
- Eble, C.F., and Cobb, J.C., 1994, Trace elements in coal—the next challenge: Kentucky Geological Survey, 4 p.
- Schweinfurth, S.P., 2003, Coal—A complex natural resource: U.S. Geological Survey, Circular 1143, 39 p.
See also Coal Information, Kentucky Geological Survey http://www.uky.edu/KGS/coal/coal_information.htm
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