title: THE INTERNATIONAL STANDARD REFERENCE ZERO FOR PURE-TONE AUDIOMETERS AND ITS RELATION TO THE EVALUATION OF IMPAIRMENT OF HEARING.
mesh_terms: D001299:Audiometry; D001301:Audiometry, Pure-Tone; D003638:Deafness; D006309:Hearing; D034381:Hearing Loss; D006801:Humans; D014481:United States; D014894:Weights and Measures
keywords: AUDIOMETRY; DEAFNESS; UNITED STATES; WEIGHTS AND MEASURES