Nonmetallic minerals needed for national defense.

Author:	O'Neill, Leo J.
Year:	1941
Document Type:	USBI
Issuing Agency:	U.S. Bureau of Mines,
SUDOC:	I 28.27:7179
Series:	Information circular / Bureau of Mines ;
Report Number:	7179.
Subjects:	Fertilizers
	Nonmetallic minerals--United States
Link:	https://hdl.handle.net/2027/mdp.39015078533646