TY  - BOOK
AU  - Elkana Yehuda
TI  - Discovery of the conservation of energy
U1  - C84, L4 
PY  - 1974///
CY  - London
PB  - Hut chinson Educational        
KW  - Physics
N1  - Bibliography:  p 199-205; Appendix:  p 175-197
ER  -