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2Illinois coal : proceedings of the fourth annual Illinois energy conference, September 16-17, 1976 /Published 1976Conference Proceeding Book
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4Published 1975Government Document Book
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5Published 1976Government Document Book
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6
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7
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8
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10Published 1977Government Document Book
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11Published 1977Government Document Book
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12Published 1977Government Document Book
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14Government Document Book
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17Published 1977Government Document Book
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18