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air pollution air pollution control air quality standards Appalachian coal bituminous coal boiler BTU gas burn Charles River Associates coal cleaning coal consumption coal conversion coal industry coal production coal reserves coal's coking coal Committee on Interior cubic deep mines desulfurization economic effect electric utility environmentally acceptable estimated factors fossil fueled fuel mix Fuels and Energy future gas cleaning systems gasification health and safety High-volatile bituminous impact increase Insular Affairs Interior and Insular Kentucky leasing policies Lignite low sulfur coal million BTU million tons miners mining regulations National Coal Association National Fuels National Petroleum Council natural gas nuclear oil import operating percent of total pilot plant pipeline projected Public Land quadrillion BTU's reclamation relative fuel prices requirements residual oil slope stack gas cleaning strip mining sulfur content sulfur oxide syncrude Syngas total coal transport western coal western coal field