TY  - BOOK
AU  - Bernal,J.D.
TI  - The extension of man: : a history of physics bofore 1900
AV  - QC7.B46 1972 
PY  - 1972///
CY  - London
PB  - Weidenfeld and Nicolson
KW  - Physics
KW  - History
N1  - Includes bibliographical references
ER  -