Heavenly clockwork: The great astronomical clocks of medieval China
NEEDHAM(Joseph) et al
Heavenly clockwork: The great astronomical clocks of medieval China - Cambridge Cambridge University Press 1960 - x p. + 254 - Antiquarian Horological Society .
Heavenly clockwork: The great astronomical clocks of medieval China - Cambridge Cambridge University Press 1960 - x p. + 254 - Antiquarian Horological Society .