Requirements for roll-over protective structures and falling object protective structures for surface coal mines and surface areas of underground coal mines /
| Main Author: | |
|---|---|
| Corporate Author: | |
| Format: | Government Document Book |
| Language: | English |
| Published: |
[Washington] :
Dept. of the Interior, Mining Enforcement and Safety Administration,
1977.
|
| Series: | Informational report (United States. Mining Enforcement and Safety Administration) ;
1036. |
| Subjects: |
| Physical Description: | 2 unnumbered pages, 56 pages : illustrations ; 27 cm. |
|---|