TY  - BOOK
ED  - National Instruments and Opthalmic Glass Limited (Calcutta, India)
TI  - Annual report
U1  - 681 
PY  - 1971///
CY  - Calcutta
PB  - National Instruments and Opthalmic Glass Limited
KW  - Optical materials
KW  - Surfaces
KW  - Opthalmic Glass Limited
ER  -