TY  - BOOK
T1  - Requirements for roll-over protective structures and falling object protective structures for surface coal mines and surface areas of underground coal mines /
DA  - 1977.
CY  - [Washington] :
AU  - Hollop, Edward E.
CN  - TN295
CN  - TN295
PB  - U.S. Dept. of the Interior, Mining Enforcement and Safety Administration,
PP  - [Washington] :
PY  - 1977.
ID  - 7971
KW  - Coal-mining machinery
KW  - Protective coverings.
TI  - Requirements for roll-over protective structures and falling object protective structures for surface coal mines and surface areas of underground coal mines /
ER  -