TY  - BOOK
AU  - Hustrulid,W.A.
AU  - Bullock,Richard C.
TI  - Underground mining methods: engineering fundamentals and international case studies 
SN  - 0873351932
AV  - TN145 U525
U1  - 622.2 21
PY  - 2001///
CY  - Littleton, Colorado
PB  - Society for Mining, Metallurgy, and Exploration
KW  - Ingeniería de minas
ER  -