Nonmetallic minerals needed for national defense.

Author:	Schallis, Alvin H.
Year:	1941
Document Type:	USBI
Issuing Agency:	U.S. Bureau of Mines,
SUDOC:	I 28.27:7170
Series:	Information circular / Bureau of Mines ;
Report Number:	7170.
Subjects:	Nitrates
	Nonmetallic minerals--United States
Link:	https://hdl.handle.net/2027/mdp.39015078533786