Drilling and broaching in slate quarries

Author:	Bowles, Oliver,
Year:	1923
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:2532
Series:	Reports of investigations ;
Report Number:	2532
Subjects:	Quarries and quarrying
	Boring
	Slate
	Broaching
Link:	https://hdl.handle.net/2027/mdp.39015086499772