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

Bibliographic Details
Main Author:	Moebs, Noel N.
Corporate Author:	United States. Bureau of Mines
Format:	Government Document Book
Language:	English
Published:	Pgh. [i.e. Pittsburgh], Pa. : U.S. Dept. of the Interior, Bureau of Mines, 1982.
Series:	Report of investigations (United States. Bureau of Mines) ; 8645.
Subjects:	Mine subsidences > Pennsylvania > Measurement. Coal mines and mining > Pennsylvania > Safety measures.

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