International conference on processing and utilization of high sulfur coals <1. ; 1985
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Tongue
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Year : 1980
Year : 1980
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Author : International conference on processing and utilization of high-sulfur coals <4. ; 1991
Year : 1991
Author : International conference on processing and utilization of high-sulfur coals <3. ; 1989
Year : 1990
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