TY  - BOOK
AU  - Parker,Steve
TI  - Wonder why: tunnels are round and other questions about building 
SN  - 0753405229
AV  - AE 5 P37W 1995
PY  - 1995///
CY  - London
PB  - Grolier
KW  - ENCYCLOPEDIAS AND DICTIONARIES
KW  - TUNNELS
N1  - Includes index
ER  -