TY  - BOOK
ED  - National Geographic Society (U.S.).
TI  - Builders of the ancient world: marvels of engineering 
SN  - 0870445855 :
AV  - TA15 .B73 1986
U1  - 620.009 23
PY  - 1986///
CY  - Washington, D.C.
PB  - The Society
KW  - Engineering
KW  - History
KW  - Architecture, Ancient
N1  - Includes Bibliography and index
ER  -