Relative pressure changes in coal pillars during extraction :
a progress report /
by Ernest A. Curth.

Description

Main Author

Curth, Ernest A.

Language(s)

English

Published

[Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1967.

Subjects

Coal mines and mining.
Mining engineering.

Note

"July 1967"--Cover.

Physical Description

20 p. : ill. ; 27 cm.

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