"United States. Congress. Senate. Committee on Governmental Affairs. Subcommittee on Energy, Nuclear Proliferation, and Governmental Processes." . . . . . . . . . "Factors affecting the export of high-sulfur coal from the eastern interior basin--conference"@en . "Factors affecting the export of high-sulfur coal from the eastern interior basin--conference" . . . . . . . . . . . . . .