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Extension course in coal mining.

APA Citation

Pennsylvania. State College. Mineral Industries Extension Services., Jones, D. C. (Donald Campbell). (193841). Extension course in coal mining. 2d ed. State College, Pa.: School of Mineral Industries, Pennsylvania State College.

MLA Citation

Pennsylvania. State College. Mineral Industries Extension Services, and Donald C. (Donald Campbell) Jones. Extension Course In Coal Mining. 2d ed. State College, Pa.: School of Mineral Industries, Pennsylvania State College, 193841.

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