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Figure 5. U.S. Coal Production Concentration, 1986, 1991, 1994, and 1997 
Figure 5. U.S. Coal Production Concentration, 1986, 1991, 1994, and 1997 
Sources: Energy Information Administration, The Changing Structure of the U.S. Coal Industry: An Update, DOE/EIA-0513(93) (Washington, DC, July 1993), Table 6; Coal Industry Annual 1994, DOE/EIA-0584(94) (Washington, DC, October 1995), Table 14; and Coal Industry Annual 1997, DOE/EIA-0584(97) (Washington, DC, December 1998), Table 15.