Progress report no. 3 on investigation of detachable rockdrill bit.

Bibliographic Details
Corporate Author:	United States. Bureau of Mines
Format:	Government Document eBook
Language:	English
Published:	[Washington] : [s.n.], 1937.
Subjects:	Mineral industries. Tools.
Online Access:	Electronic resource (PDF)

Description
Item Description:	Includes tables and illustrations.
Physical Description:	1 online resource (29 pages), digital, PDF file

Progress report no. 3 on investigation of detachable rock­drill bit.