TY  - BOOK
AU  - Stefanko, Robert,
AU  - Bise, Christophe J.,
ED  - Society of Mining Engineers of AIME
TI  - Coal mining technology: Theory and practice 
SN  - 0895204045
AV  - TN803 S83
PY  - 1983///
CY  - New York
PB  - Society of mining engineers
KW  - Minas de carbón
ER  -