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Clay veins :
their occurrence, characteristics, and support /
by Frank E. Chase and James P. Ulery.

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Main Author: Chase, Frank E.
Related Names: Ulery, J. P.
Language(s): English
Published: [Pittsburgh, Pa.] : U.S. Dept. of the Interior, Bureau of Mines, [1987]
Subjects: Coal mines and mining > Coal mines and mining / Safety measures.
Clay veins.
Ground control (Mining)
Physical Description: 19 p. : ill. ; 28 cm.
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