Timbering of Metal Mines

Author:	Holbrook, Elmer Allen
Additional Authors:	Ageton, Richard V.
Year:	1923
Document Type:	N/A
SUDOC:	I 28.3:215
Series:	United States Bureau of Mines Reports
Report Number:	Bulletin 215
Subject:	Mine timbering.
Link:	http://digital.library.unt.edu/ark:/67531/metadc38757/