Production, employment, and output per man in gypsum mining

Author:	Newcomb, Robinson,
Additional Authors:	Peterson, Knute.
Year:	1940
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7134
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	7134
Subjects:	Gypsum--United States
	Gypsum industry--United States
	Gypsum mines and mining--United States
Link:	https://hdl.handle.net/2027/mdp.39015078534396