TY  - BOOK
AU  - Nilsen, Bjorn & Thidemann, Alf.
TI  - Hydropower development: rock engineering 
SN  - 8275980178
AV  - D4350 
U1  - 624.15132 22
PY  - 1993///
CY  - Norway
PB  - Norwegian institute of Technology.
ER  -