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- [3] Nature of coal TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1921, 65 : 217 - 222
- [5] Nature and applicability of coal ZEITSCHRIFT DES VEREINES DEUTSCHER INGENIEURE, 1925, 69 : 899 - 904
- [7] THE ORIGIN OF QUARTZ IN COAL ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1984, 188 (AUG): : 7 - FUEL