TY  - BOOK
AU  - Twyman, Frank
TI  - OPTICAL GLASSWORKING
U1  - 535.8 
PY  - 1955///
CY  - London
PB  - Hilger & Watts
KW  - Prisms
KW  - Lenses
N1  - An Abridged Edition Of The Author'S Prism And Lens Making
ER  -