Reissue of P05-19
Subtitle: use of mobile roof support (MRS) units for retreat mining
Series: Program information bulletin -- no. P 11-30; Program information bulletin -- no. P 11-30.
Publisher: U.S. Dept. of Labor, Mine Safety and Health Administration
Published: 2011
Place of publication: Arlington, Va
Language: eng
Format: [electronic resource] :
Subjects: Mine roof control; Safety measures; Mine roof bolting; Pillaring (Mining); Mining machinery; Mine safety
Other titles: Use of mobile roof support (MRS) units for retreat mining; Re-issue
Notes: Title from title screen (viewed on July 21, 2011).

"Issue date 4/27/2011."