TY  - BOOK
AU  - Dunn, Andrew
TI  - Tunnels
T2  - Structures
SN  - 9780750204941
U1  - 629.23 
PY  - 1990///
CY  - London
PB  - Wayland
N2  - Explains tunnel-building methods, looks at various types of tunnels and discusses their uses
ER  -