Pillar recovery design, technologies, and procedures in roof control plan reviews.
| Format: | Government Document eBook |
|---|---|
| Language: | English |
| Published: |
Arlington, Virginia :
U.S. Department of Labor, Mine Safety and Health Administration,
2012.
|
| Series: | Procedure instruction letter ;
no. I12-V-02. |
| Subjects: | |
| Online Access: | https://purl.fdlp.gov/GPO/gpo80838 |
| Item Description: | "Effective date: 02/16/2012; expiration date: 03/21/2014." |
|---|---|
| Physical Description: | 1 online resource (5 pages). |