TY  - BOOK
ED  - National Geographic Society U.S.
TI  - The Builders: marvels of engineering
SN  - 0870448366
AV  - TA15 .B85 1992
U1  - 620 20
PY  - 1992///
CY  - Washington, DC
PB  - The Society
KW  - Engineering
KW  - History
KW  - Local
N1  - Includes index
ER  -