TY  - BOOK
AU  - Singh,Bhawani
AU  - Goel,R.K.
TI  - Rock mass classification: a practical approach in civil engineering
SN  - 0080430139
U1  - 624.151 
PY  - 1999///
CY  - Amsterdam
PB  - Elsevier
KW  - Τεχνική γεωλογία
KW  - Βραχομηχανική
N1  - Includes bibliographical references and indexes
ER  -