TY  - BOOK
AU  - Bieniawski, Z.T.
TI  - Engineering rock mass clasifications : a complete manual for engineers and geologists in mining, civil and prtroleum engineering
SN  - 9780471601722 
U1  - 624.15132 
PY  - 1989///
CY  - New York
PB  - Wiley-Interscience, John Wiley and Sons
KW  - Civil engineering
KW  - Geology
KW  - Economics
KW  - Rocks-classification
KW  - Rock-mechanics
ER  -