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	1.	No cover image available Acoustics: Standard reference zero for the calibration of pure-tone air conduction audiometers/ prepared by Technical Committee ISO/TC 43, Acoustics by International Organization for Standardization Edition: 3rd.ed. Publication details: Geneva: ISO, 1991 Availability: Items available for loan: National Acoustic Laboratories (1)Call number: ISO 389. Place hold Add to cart (remove)
	2.	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)