Coal Resource Classification System of the U.S. Geological Survey

By Gordon H. Wood, Jr., Thomas M. Kehn, M. Devereux Carter, and William C. Culbertson

GEOLOGICAL SURVEY CIRCULAR 891

Figure 7 - Coal regions of the conterminous United States

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U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/circ/c891/figures/figure7.htm
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