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Figure 7. Ratios of U.S. Coal Reserves to Annual Production and Productive Capacity, 1991, 1994, and 1997 
Figure 7. Ratios of U.S. Coal Reserves to Annual Production and Productive Capacity, 1991, 1994, and 1997 
Sources: Energy Information Administration, Coal Production 1991, DOE/EIA-0118(91) (Washington, DC, October 1992), Table 33; Coal Industry Annual 1994, DOE/EIA-0584(94) (Washington, DC, October 1995), Table 17; Coal Industry Annual 1997, DOE/EIA-0584(97) (Washington, DC, December 1998), Table 18.