TY  - GEN
TI  - Builders of the ancient world: marvels of engineering 
SN  - 0870445855
U1  - 624.09  
PY  - 1986///
CY  - Washington D C : 
PB  - National Geographical Society
KW  - Engineering history
KW  - Architecture, ancient
N1  - Includes bibliographical references and index
ER  -