Permissible Coal-Cutting Equipment Approved Prior to July 1, 1932

Author:	Ilsley, L. C.
Additional Authors:	Brunot, H. B.
Year:	1934
Document Type:	N/A
Series:	United States Bureau of Mines Reports
Report Number:	Bulletin 382
Link:	https://digital.library.unt.edu/ark:/67531/metadc12550/