http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
demographic and socioeconomic characteristics-United States
National Center for Health Statistics (U.S.)
1 online resource (iv, 33 pages) : illustrations.
"Binocular central visual acuity findings at distance and near without correction for children 6-11 years of age, by race, region, size of place of residence, rate of population change from 1950 to 1960 in place of residence, family income, education of parent, and grade in school."
Includes bibliographical references (page 12).