Effect of changes in moisture and temperature on mine roof.

Author:	Hartmann, Irving.
Additional Authors:	Greenwald, H. P.
Year:	1941
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:3588
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	3588
Subjects:	Coal mines and mining--Pennsylvania--Pittsburgh
	Mine roof control--Pennsylvania--Pittsburgh
Links:	https://hdl.handle.net/2027/mdp.39015078518019
	no.3581-3600 1941