TY  - BOOK
AU  - Obert, Leonard
AU  - Duvall, Wilbur I.
TI  - ROCK MECHANICS AND THE DESIGN OF STRUCTURES IN ROCK
U1  - 624.15 
PY  - 1967///
CY  - New York
PB  - Wiley
KW  - Rock Mechanics
KW  - Underground Construction
N1  - Includes Bibliographies
ER  -