Some Innovations in Equipment For Scaling High Roofs and Mine Walls

Author:	Brown, Brinton C.
Additional Authors:	Wright, Fred D.
Year:	1950
Document Type:	N/A
SUDOC:	I 28.23:4739
Series:	United States Bureau of Mines Reports
Report Number:	R. I. 4739
Subjects:	Mine safety.
	Coal mines and mining -- Equipment and supplies.
Link:	http://digital.library.unt.edu/ark:/67531/metadc38551/