TY  - BOOK
AU  - Gibbons,Gail
TI  - Tunnels
SN  - 0823405079
U1  - 624.1/93 19
PY  - 1984///
CY  - New York
PB  - Holiday
KW  - Tunnels
KW  - sears
N2  - A brief introduction to tunnels--their types, shapes, and parts, and how they are built
ER  -