Cite
MLA Citation
British Standards Institution,. Optics and optical instruments. Ophthalmology. Graduated dial scale.. London : British Standards Institution, 1987. http://access.bl.uk/ark:/81055/vdc_100104777640.0x000001
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British Standards Institution,. Optics and optical instruments. Ophthalmology. Graduated dial scale.. London : British Standards Institution, 1987. http://access.bl.uk/ark:/81055/vdc_100104777640.0x000001