Coal mine roof and rib control.
APA Citation
National Mine Health and Safety Academy. (1991). Coal mine roof and rib control. [Washington, D.C.?]: U.S. Dept. of Labor, Mine Safety and Health Administration, National Mine Health and Safety Academy.
MLA Citation
National Mine Health and Safety Academy. Coal Mine Roof And Rib Control. [Washington, D.C.?]: U.S. Dept. of Labor, Mine Safety and Health Administration, National Mine Health and Safety Academy, 1991.
Warning: These citations may not always be complete (especially for serials).