Preparation characteristics of coal from Butler County, Pa.

Author:	Gray, T. E.
Additional Authors:	Palowitch, Eugene R.
Year:	1960
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:5609
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	5609
Subjects:	Coal preparation
	Coal--Pennsylvania--Butler County
Links:	https://hdl.handle.net/2027/mdp.39015078528331
	no.5609 1960