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Enhanced coal technology : hearing before the Subcommittee on Energy and mineral Resources of the Committee on Energy and Natural Resources, United States Senate, Ninety-eighth Congress, first session, on enhanced coal technology : coal's market for the eighties, August 9, 1983
- "Enhanced coal technology : hearing before the Subcommittee on Energy and mineral Resources of the Committee on Energy and Natural Resources, United States Senate, Ninety-eighth Congress, first session, on enhanced coal technology : coal's market for the eighties, August 9, 1983"@en
- "Enhanced coal technology hearing before the Subcommittee on Energy and mineral Resources of the Committee on Energy and Natural Resources, United States Senate, Ninety-eighth Congress, first session, on enhanced coal technology : coal's market for the eighties, August 9, 1983"@en