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- [5] ATLAS OF PENNSYLVANIA COAL AND COAL MINING, PT 1, BITUMINOUS COAL - DEASY,GF, GRIESS,PR PROFESSIONAL GEOGRAPHER, 1960, 12 (02): : 35 - 36
- [7] Constitution and nature of Pennsylvania anthracite with comparisons to bituminous coal TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1930, 88 : 627 - 641
- [8] WILDCAT STRIKES IN BITUMINOUS COAL MINING INDUSTRIAL & LABOR RELATIONS REVIEW, 1979, 32 (04): : 465 - 483