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Reissue of P05-19 : use of mobile roof support (MRS) units for retreat mining.

Bibliographic Details
Corporate Author:	United States. Mine Safety and Health Administration
Format:	Government Document eBook
Language:	English
Published:	[Arlington, Va.] : [U.S. Dept. of Labor, Mine Safety and Health Administration], [2011]
Series:	Program information bulletin ; no. P 11-30.
Subjects:	Mine roof control > United States > Safety measures. Mine roof bolting > Safety measures. Pillaring (Mining) > Safety measures. Mining machinery > United States. Mine safety > United States.
Online Access:	https://purl.fdlp.gov/GPO/gpo10265

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