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1.- Coal quality: global priorities international conference U.S. Geological Survey - Reston, Virginia September 24-26, 2001
Pierce, Brenda S., ed.; Dennen, Kristin O., ed.; Finkelman, Robert B., ed.; Congreso - Coal Quality International Conference (2001. Reston, Virginia, Estados Unidos)
Reston: United States Govenrment, 2004
U.S. Geological Survey Circular
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2.- The National Coal Resource Assessment overview
The National Coal Resource Assessment (Estados Unidos); Pierce, Brenda S., ed.; Dennen, Kristin O., ed.
Reston (Virginia): U.S. Geological Survey, 2009
U.S. Geological Survey Professional Paper
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