TY  - BOOK
AU  - 
TI  - Design Of Underground Hard - Coal Mines
SN  - 0444989382
U1  - 622.334 PAZ  
PY  - 1988///
CY  - New York
PB  - Elseiver
KW  - Mining Engineering
N1  - Includes bibliographical references ( p. 227 - 229 ).  indexs ( p. 231 - 233 )
ER  -