BS 3224 : Section D7 : 1961 : Specification for lighting fittings for civil land aerobromes. Part D. Runway Lights. Section D7. Omni-directional elevated runway-Threshold lighting fittings
- London British Standards Institution
STD1394
BS 3224 : Section D7 : 1961
STD1394
BS 3224 : Section D7 : 1961