TY  - BOOK
AU  - Hakes, G.
CN  - TN23 .U44 1980-39
CN  - TN23
CY  - Princeton, N.J. :
DA  - 1978.
ID  - 32653
KW  - Mine roof bolting.
KW  - Coal mines and mining
N1  - Cover title.
PB  - Ingersoll-Rand Research,
PP  - Princeton, N.J. :
PY  - 1978.
T1  - Remote operator coal mine roof bolter concepts utilizing existing techniques and components :final report /
TI  - Remote operator coal mine roof bolter concepts utilizing existing techniques and components :final report /
ER  -