Design practices for multiple-seam room-and-pillar mines.

Bibliographic Details
Corporate Author:	United States. Bureau of Mines
Format:	Government Document Book
Language:	English
Published:	Washington, DC : Bureau of Mines, U.S. Dept. of the Interior, [1994]
Series:	Technology news ; no. 443.
Subjects:	Coal mines and mining > United States > Designs and plans.
Online Access:	https://purl.fdlp.gov/GPO/LPS91696

Available Online