TY  - BOOK
AU  - 
AU  - 
ED  - North American Rapid Excavation and Tunneling Conference
ED  - American Society of Civil Engineers
ED  - American Institute of Mining, Metallurgical, and Petroleum Engineers.
TI  - Rapid excavation and tunneling conference, Los Angeles, California, 1989: proceedings 
U1  - 624 
PY  - 1989///
CY  - New York
PB  - Society of Mining Engineers
KW  - Tunneling
KW  - Congresses
KW  - Excavation
KW  - Underground construction
ER  -