Nonmetallic minerals needed for national defense :2. abrasives

Author:	O'Neill, Leo J.
Year:	1941
Document Type:	USBI
Issuing Agency:	U.S. Bureau of Mines,
SUDOC:	I 28.27:7168
Series:	Information circular / Bureau of Mines ;
Report Number:	7168
Subjects:	Abrasives
	Nonmetallic minerals--United States
Link:	https://hdl.handle.net/2027/mdp.39015078533919