TY  - BOOK
AU  - Obert,Leonard
AU  - Duvall,Wilbur I.
TI  - Rock mechanics and the design of structures in rock
U1  - 625.15 
PY  - 1967///]
CY  - New York
PB  - Wiley
KW  - Rock mechanics
KW  - Underground construction
N1  - Includes bibliographies
ER  -