State laws relating to coal-mine timbering.

Bibliographic Details

Other Authors:	Geyer, John Nicholas, 1896-, Paul, J. W. (James Washington)
Format:	Government Document eBook
Language:	English
Published:	[Washington?] : U.S. Government Printing Office, 1928.
Series:	Mines Bur. Technical Paper No. 421
Subjects:	Mine timbering. Electronic books.
Online Access:	Connect to the full text of this electronic document