TY  - BOOK
AU  - Schach,R.
AU  - Garshol,K.
AU  - Heltzen,A.M.
TI  - Rock bolting: a practical handbook 
SN  - 0080225039
PY  - 1979///
CY  - Oxford
PB  - Pergamon Press
KW  - Rock bolts
ER  -