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1.
Effect Of Inerts On Coking Properties Of Pittsburgh Bed Coal: Mining And Metallurgical Inves... by Joseph D. Davis, O. G. Hanson ISBN: 9781258606954 List Price: $35.95
2.
Effect Of Inerts On Coking Properties Of Pittsburgh Bed Coal: Mining And Metallurgical Inves... by Joseph D. Davis, O. G. Hanson ISBN: 9781258609801 List Price: $20.95