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7Published 1988Subjects: “...Coal Desulfurization United States Periodicals....”
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8Published 1991Subjects: “...Coal Desulfurization United States Periodicals....”
Government Document Microform Serial -
9Published 1995Subjects: “...Coal mines and mining United States....”
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Government Document Serial -
11Published 1982Subjects: “...Coal trade Alabama Statistics Periodicals....”
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20Published 1995Subjects: “...Coal mines and mining United States Periodicals....”
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