Costs of mining under bolted roof and timbered roof in bituminous coal mines /
by M.J. Ackerman and J.J. Wallace.

Description

Main Author

Ackerman, M. J.

Related Names

Wallace, Joseph J.
United States. Bureau of Mines.

Language(s)

English

Published

Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1961.

Subjects

Coal mines and mining.
Bituminous coal.

Physical Description

21 p. : ill. ; 27 cm.

Locate a Print Version

Find in a library

Viewability