Roof and rib fall accident and cost statistics :an in-depth study

Author:	Pappas, Deno M.
Year:	1987
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:9151
Series:	Information circular / Bureau of Mines ;
Report Number:	9151
Subjects:	Mine roof control
	Mine accidents
Link:	https://hdl.handle.net/2027/mdp.39015078465583