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- [38] Low-sulfur coal in Pennsylvania TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1920, 63 : 649 - 658
- [39] NEED FOR LOW-SULFUR STEELS REVUE DE METALLURGIE-CAHIERS D INFORMATIONS TECHNIQUES, 1974, 71 (04): : 333 - 344
- [40] Low-sulfur coal in Illinois TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1920, 63 : 641 - 648