Falls of roof
Subtitle: the no. 1 killer in bituminous-coal mines
By: by J.J. Forbes, T.L. Back, and H.F. Weaver.
Contributors: Back, T.L.; Weaver, H.F.; United States. Bureau of Mines.
Series: Information circular (United States. Bureau of Mines) -- 7605
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1951
Place of publication: Washington, DC
Language: eng
Number of pages: 11
Notes: 1