Tunnel driving methods used at Ojuela unit of Compania Minera de Penoles, S. A., Ojuela, Durango, Mexico.

Bibliographic Details

Corporate Author:	Compañía Minera de Peñoles
Other Authors:	Savage, John P.
Format:	Government Document eBook
Language:	English
Published:	Washington, D.C. : [publisher not identified], 1931.
Series:	Mines Bur. Info. Circ. No. 6480
Subjects:	Tunnels. Electronic books.
Online Access:	Connect to the full text of this electronic document