Primary crushing :progress report no. 3

Author:	Sheppard, Mark.
Year:	1938
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:3390
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	3390
Subjects:	Ore-dressing
	Quarries and quarrying
Link:	https://hdl.handle.net/2027/mdp.39015095092220