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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. 
FIGURE 4–2 Coal fields of the coterminous United States. Source: Adapted from Paul Averitt Coal Resources of the United States, January 1, 1974, U.S. Department of the Interior, Geological Survey Bulletin 1412 (Washington, D.C.: U.S. Government Printing Office (Stock No. 024–001–02703), 1975), p. 5; and U.S. Department of Energy, Energy Information Administration, Coal Data (Washington, D.C.: U.S. Government Printing Office (DOE/EIA-0064), 1978), p. 1.
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