TY  - BOOK
AU  - AHUJA (T D)
AU  - BIRDI (G S).
TI  - Roads,railways, bridges and tunnel engineering. Ed 6
U1  - 625 AHUR 
PY  - 1980///
CY  - Delhi.
PB  - Standard Book House
KW  - tunnel
KW  - Roads,railways
KW  - engineering
KW  - Ed
KW  - bridges
KW  - and
KW  - 6
ER  -