Cite
MLA Citation
British Standards Institution,. Ophthalmic optics. Semi-finished spectacle lens blanks.. London : British Standards Institution, 1996. http://access.bl.uk/ark:/81055/vdc_100104908697.0x000001
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British Standards Institution,. Ophthalmic optics. Semi-finished spectacle lens blanks.. London : British Standards Institution, 1996. http://access.bl.uk/ark:/81055/vdc_100104908697.0x000001