TY  - BOOK
AU  - Twyman F
TI  - Prism and lens making: a textbook for optical glassworkers
U1  - 681.42 
PY  - 1957///
CY  - London
PB  - Hilger & Watts
KW  - Lens making
KW  - Lenses
KW  - Optical glassworkers
KW  - Prism
ER  -