TY  - BOOK
AU  - Thimons, H.U. Friadrich
AU  - H.H. Fields
TI  - Coal: Current Advances in Mining Techniques
U1  - 622. 33 
PY  - 1976///
CY  - New York
PB  - M.S.S.
KW  - Coal: Current Advances in Mining Techniques
N1  -  Coal
ER  -