TY  - DATA
AU  - Bieniawski,Z.T.
TI  - Engineering rock mass classifications: a complete manual for engineering and geologists in mining, civil, and petroleum engineering 
SN  - 0471601721
U1  - 624.15132 22
PY  - 1989///
CY  - USA
PB  - John Wiley & Sons
KW  - Engineering
N1  - Includes bibliography and index
ER  -