Economic benefits of systematic roof bolting in Zeigler no. 3 mine, Bell & Zoller Coal & Mining Co., Williamson County, Ill.
By: by L. W. Kelly.
Contributors: United States. Bureau of Mines.
Series: Information circular (United States. Bureau of Mines) -- 7633
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1952
Place of publication: Washington, DC
Language: eng
Subjects: Mine roof bolting.
Notes: 1