Recommendation for safety in coal mining relating to placing main haulage in intake air.

Bibliographic Details
Format:	Government Document eBook
Language:	English
Published:	Washington, D.C. : [publisher not identified], 1929.
Series:	Mines Bur. Info. Circ. No. 6139
Subjects:	Mine safety > United States. Electronic books.
Online Access:	Connect to the full text of this electronic document

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