http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
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
National Center for Health Statistics (U.S.)
1 online resource (iv, 84 pages) : illustrations, charts.
Includes bibliographical references (page 24).