TY  - BOOK
AU  - Needham,Joseph
AU  - Ling,Wang
AU  - Price,Derek J.De Solla
TI  - Heavenly clockwork: the great astronomical clocks of medieval china 
U1  -  681.110951 
PY  - 1960///
CY  - Cambridge
PB  - The University Press
KW  - Clocks and watches
N1  - Includes index
ER  -