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1Illinois coal : proceedings of the fourth annual Illinois energy conference, September 16-17, 1976 /Published 1976Conference Proceeding Book
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2Published 1975Government Document Conference Proceeding Book
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3Published 1976Government Document Conference Proceeding Book
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4Published 1977Government Document Book
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12Published 1976Government Document Book
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14Government Document Book
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15Published 1976Government Document Conference Proceeding Book
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16Published 1975Government Document Book
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18Published 1976Government Document Book
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