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Hearing Levels of Youths 12-17 Years, United States : Distribution of Monaural Hearing Levels of Youths 12-17 Years at Frequencies of 250, 500, 1000, 2000, 3000, 4000, 6000, and 8000 Hertz As Determined in Individual Air-Conduction Tests, by Age, Sex, Race, Geographic Region, Size of Place of Residence, Family Income, and Education of Parent by Jean Roberts and Elizabeth M. Ahuja (1975, Hardcover)