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- [5] NEW API MARKINGS FOR EASY IDENTIFICATION OF LOW-SULFUR, HIGH-SULFUR FUEL DIESEL PROGRESS ENGINES & DRIVES, 1994, 60 (02): : 8 - 8
- [7] Low-sulfur coal in Pennsylvania TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1920, 63 : 649 - 658
- [8] Low-sulfur coal in Illinois TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1920, 63 : 641 - 648