Subsidence over four room-and-pillar sections in southwestern Pennsylvania /

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Bibliographic Details
Main Author: Moebs, Noel N.
Format: Book
Language:English
Published: Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1982.
Series:Report of investigations 8645
Subjects:
Mine subsidence > Pennsylvania > Measurement.
Coal mines and mining > Pennsylvania > Safety measures.
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