Geological Survey Bulletin, Ausgabe 1528U.S. Department of the Interior, Geological Survey; Washington, D.C., 1949 |
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12 coal samples 331 Appalachian region 509 bituminous coal Abbs Valley Allegheny Front Arithmetic mean ash content ash-fusion temperatures basin bituminous coal samples Btu/lb chemical analyses chemical elements cleat coal ash coal rank coal resources coal-quality data coal(s density Department of Energy deposited depth of burial Englund fixed carbon fixed-carbon values forms of sulfur free-swelling index number geologic map GEOLOGICAL SURVEY COAL geometric deviation Harnsberger heat of combustion heat value Horsepen coal bed Inertinite laboratory ash McDowell County medium-volatile bituminous coal metamorphic grade minor oxides moisture observed range physical properties Pocahontas Formation Pocahontas syncline River Formations rock sample VAT-6 samples from Virginia sandstone shale siltstone single coal bed sp gr spheroidal weathering study area sulfur SURVEY COAL ANALYSES syncline Tazewell County trace-element composition U.S. Department U.S. Geological Survey Upper Horsepen coal Virginia and West vitrinite vitrinite reflectance volatile matter War Creek West Virginia whole coal whole-coal basis