TY  - BOOK
AU  - Farago,Peter Stephen
TI  - Free-electron physics
T2  - Penguin library of physical sciences: physics 
SN  - 0140800999
U1  - 537.5 
PY  - 1970///
CY  - Harmondsworth
PB  - Penguin
KW  - Electron optics
KW  - Vacuum-tubes
ER  -