Needham, Joseph., [et al] <br/><br/>
Heavenly clock work  great astronomical clocks of medieval China 
by Joseph Needham, [et al] 
 - Cambridge  Cambridge University Press  1960 
 - xv, 253p. 
 - Antiquarian horological society monograph  No.1 .
<br/><br/><label>Dewey Class. No.: </label>529.78  / N60