Study of mine roof of Pittsburgh coal bed in Pittsburgh mining district.

Bibliographic Details

Other Authors:	Paul, J. W. (James Washington), Plein, Leopold Nicholas, 1897-
Format:	Government Document eBook
Language:	English
Published:	[Washington?] : U.S. Government Printing Office, 1932.
Series:	Mines Bur. Technical Paper No. 541
Subjects:	Mine roof control. Electronic books.
Online Access:	Connect to the full text of this electronic document