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- [37] Low-sulfur coal in Pennsylvania TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1920, 63 : 649 - 658
- [38] NEED FOR LOW-SULFUR STEELS REVUE DE METALLURGIE-CAHIERS D INFORMATIONS TECHNIQUES, 1974, 71 (04): : 333 - 344
- [39] Low-sulfur coals of Kentucky TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1920, 63 : 723 - 726
- [40] OVERHEATING IN LOW-SULFUR STEELS JOURNAL OF THE AUSTRALASIAN INSTITUTE OF METALS, 1976, 21 (2-3): : 126 - 131