Intellectual development and school achievement of youths 12-17 years : demographic and socioeconomic factors /
Hitchcock, Dale C.
Oliver, Lincoln I.
Rockville, Md. : U.S. Department of Health, Education, and Welfare, Public Health Service, Health Resources Administration, National Center for Health Statistics,
1976.
Includes bibliographical references.
Educational tests and measurements.
Students
Students
Academic achievement.