TY  - BOOK
AU  - Obert,Leonard
AU  - Duvall,Wilbur I.
TI  - Rock mechanics an the desing of structures in rock
SN  - 0471652350
PY  - 1967///
CY  - New York
PB  - J. Wiley
KW  - Minería
KW  - lemb
KW  - Libro
KW  - unescot
ER  -