Cite
MLA Citation
British Standards Institution,. Specification for high-pressure sodium vapour lamps.. London : British Standards Institution, 1990. http://access.bl.uk/ark:/81055/vdc_100104988578.0x000001
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British Standards Institution,. Specification for high-pressure sodium vapour lamps.. London : British Standards Institution, 1990. http://access.bl.uk/ark:/81055/vdc_100104988578.0x000001