ASSESSMENT OF THE COAL RESOURCES OF THE KYRGYZ REPUBLIC:

COAL CHARACTER AND DISTRIBUTION, GEOLOGY, MINING, AND IMPORTANCE TO THE NATION'S FUTURE

USGS Open File Report 97-137A (English)

Figure 6. Percentage of original resources of 11 quadrangles of the central Appalachian coal field, U.S.A., in different recoverable and nonrecoverable categories.

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U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/of/1997/of97-137a/fig_06.htm
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