31. Specification for pure tone air conduction threshold audiometry for hearing conservation purposes. (31st January 1986) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (18 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
32. Specification for reference levels for narrow-band masking noise. (29th September 1989) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (12 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
33. Specification for threshold of hearing by air conduction as a function of age and sex for otologically normal persons. (29th February 1988) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (14 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
34. Tracked Changes. Electroacoustics. Audiometric equipment. Instruments for the measurement of otoacoustic emissions Part 6, (28th June 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (50 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗