Longer-than-seam-height drill development program /

Bibliographic Details

Main Author:	Derby, G. K. (George K.)
Corporate Author:	United States. Bureau of Mines
Other Authors:	Bevan, John E.
Format:	Government Document Book
Language:	English
Published:	[Washington] : Dept. of the Interior, Bureau of Mines, 1978.
Series:	Report of investigations (United States. Bureau of Mines) ; 8273.
Subjects:	Boring. Mine roof bolting.