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- [4] Low-sulfur coal in Pennsylvania TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1920, 63 : 649 - 658
- [5] Low-sulfur coal in Illinois TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1920, 63 : 641 - 648
- [10] Explosion protection for low-sulfur coal Power Engineering (Barrington, Illinois), 1995, 99 (11): : 45 - 48