TY  - BOOK
AU  - Aldorf,Josef
AU  - Exner,Karel
TI  - Mine openings: stability and support 
SN  - 0444995250
PY  - 1986///
CY  - Amsterdam
PB  - Elsevier North-Holland
KW  - Shaft sinking
KW  - Ground control (Mining)
N1  - Includes indexes
ER  -