TY  - BOOK
AU  - El Kalreh, A B
AU  - 
TI  - Electron beams, lenses and optics
U1  - 621.3.032.26 
PY  - 1970///
CY  - New York
PB  - Academic Press
KW  - lenses and optics
KW  - optics and lenses
ER  -