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	1.	No cover image available Acoustics: Reference zero for the calibration of pure-tone air conduction audiometers - Part 3: Reference equivalent threshold force levels for pure tones and bone vibrators prepared by Technical Committee ISO/TC 43, Acoustics by International Organization for Standardization Material type: Text; Format: print ; Literary form: Not fiction Publication details: Geneva: ISO, 1994 Availability: Not available: National Acoustic Laboratories: Checked out (1). Place hold Add to cart (remove)
	2.	No cover image available ISO R226. Normal equal-loudness contours for pure tones and normal threshold of hearing under free field listening conditions by International Organization for Standardization Material type: Text; Format: print ; Literary form: Not fiction Publication details: International Organization for Standardization Geneva December 1961 Availability: Items available for loan: National Acoustic Laboratories (1)Call number: R226 -1961. Place hold Add to cart (remove)

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