Falls of roof in bituminous coal mines :
influence of the seasons and rate of production /
by J.W. Paul.

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Main Author: Paul, J. W. (James Washington)
Language(s): English
Published: Washington, D.C. : U.S. Dept. of Commerce, Bureau of Mines : 1929.
Subjects: Coal mine accidents.
Bituminous coal.
Physical Description: ii, 40 p. : ill. ; 24 cm.
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