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Salvage of coal from mine refuse in the Pittsburgh district
Methods of producing ultra-clean coal for electrode carbon in Germany
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Published Year
1940-1949 (2) *
Subject
Coal--Germany (1)
Coal--Pennsylvania--Pittsburgh (1)
Author
Graham, H. G. (2) *
Fraser, Thomas. (1)
Kelley, J. A. (1)
Schmidt, L. D. (1)
