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A study of roof in Pennsylvania mines contiguous to Monongahela River
Tests on the effect of acid mine waters on various cements
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Published Year
1930-1939 (1)
1940-1949 (1)
Subject
Coal mines and mining--Pennsylvania--Pittsburgh (1)
Water--Pollution (1)
Author
Calverley, J. G. (2) *
Leitch, R. D. (1)
Paul, J. W. (1)
