Rock dusting by hand method

Author:	Harrington, D.
Additional Authors:	Owings, C. W.
Year:	1928
Document Type:	MAIN
SUDOC:	C 22.11:6087
Series:	Information circular / Bureau of Mines ;
Report Number:	6087
Subject:	Coal mines and mining--Dust control
Link:	https://hdl.handle.net/2027/mdp.39015095077536