Questions and answers on roof support in bituminous-coal mines
Subtitle: A handbook
By: by J. J. Forbes, Edward Thomas and A. J. Barry
Publisher: U.S. Govt. Print. Off.
Published: 1951
Place of publication: Washington, D.C
Language: eng
Number of pages: 90
Other titles: Roof support in bituminous-coal mines.
Notes: At head of title: United States Department of the Interior, Oscar L. Chapman, Secretary. Bureau of Mines, James Boyd, Director.