TY  - SER
ED  - National Committee on tunneling Technology
TI  - Tunneling technology newsletter
SN  - 0095-2664
AV  - TA800 
U1  - 624.19 
PY  - 1973///-1990
CY  - Washington, D.C.
PB  - National Committee on Tunneling Technology
KW  - Tunelizacion
N1  - Inicia en 1973, cierra en 1990; AESIS quarterly; Coal abstracts; Bibliography and index of ecology; GeoRef; Ediciones mar. 1974 - feb. 1990 tambien llamados no. 5 - no. 68
ER  -