TY  - BOOK
AU  - Bernal,John Desmond
TI  - Science in history Vol.4
AV  - CB151.B4 Vol.4 
PY  - 1969///
CY  - London
PB  - : C. A. Watts and Company
KW  - Science and civilization
KW  - Civilization, History
N1  - Includes bibliography


ER  -