TY  - BOOK
AU  - Obrig,Theodore Ernst
TI  - Modern ophthalmic lenses and optical glass,
AV  - RE961 .O3 1944
U1  - 617.75 
PY  - 1944///
CY  - New York, [Philadelphia
PB  - The Chilton company, Printing division]
KW  - Lenses
KW  - Optical glass
N1  - Bibliography: p. 302-306
ER  -