Factors and conditions that aid in alinement of pillar extraction lines in coal mining /
by J.N. Geyer.

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Main Author: Geyer, John Nicholas, 1896-
Language(s): English
Published: Washington : U.S. Bureau of Mines, 1933.
Subjects: Coal mines and mining > Coal mines and mining / Pennsylvania.
Mining engineering.
Physical Description: 22 p., [8] leaves of plates : ill. ; 27 cm.
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