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Coal mining.

APA Citation

Jones, D. C. (Donald Campbell)., Pennsylvania State College. School of Mineral Industries. Mineral Industries Extension Services. (1941). Coal mining. 2d ed. State College, Pa.: Division of mineral industries extension, School of mineral industries, Pennsylvania state college.

MLA Citation

Jones, Donald C. (Donald Campbell), and Pennsylvania State College. School of Mineral Industries. Mineral Industries Extension Services. Coal Mining. 2d ed. State College, Pa.: Division of mineral industries extension, School of mineral industries, Pennsylvania state college, 1941.

Warning: These citations may not always be complete (especially for serials).