TY  - BOOK
ED  - National Geographic Society (U.S.).
TI  - Builders of the ancient world: marvels of engineering 
SN  - 0870445855
AV  - TA16 .B85 1986
U1  - 624/.09 19
PY  - 1986///
CY  - Washington, D.C.
PB  - The Society
KW  - Architecture, Ancient
KW  - Engineering
KW  - History
N1  - Includes index; Bibliography: p. 199
ER  -