Coal Mining Techniques in the Federal Republic of Germany - 1971

Author:	Curth, Ernest A.
Year:	1974
Document Type:	N/A
SUDOC:	I 28.27:8645
Series:	United States Bureau of Mines Reports
Report Number:	I. C. 8645
Subjects:	Mining engineering.
	Coal mines and mining -- Germany.
	Mine roof bolting.
Link:	http://digital.library.unt.edu/ark:/67531/metadc170840/