1
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Coal -- Desulfurization -- Economic aspects -- United States. / https://id.loc.gov/authorities/subjects/sh85027313 https://id.loc.gov/authorities/subjects/sh99005484 https://id.loc.gov/authorities/names/n78095330-781 : United States.
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1990
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1
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2
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Coal -- Desulfurization -- Technological innovations -- United States. / https://id.loc.gov/authorities/subjects/sh85027313 https://id.loc.gov/authorities/subjects/sh2001009095 https://id.loc.gov/authorities/names/n78095330-781 : United States.
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1990
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1
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