Columbia subject headings:
Education--United States--Longitudinal studies.
Educational statistics.
Educational surveys--United States.
Eighth grade (Education)--Longitudinal studies.
Harvard subject headings:
Education--United States--Longitudinal studies.
Educational statistics.
Educational surveys--United States.
Eighth grade (Education)--Longitudinal studies.
Princeton subject headings:
Education--United States--Longitudinal studies.
Educational statistics.
Educational surveys--United States.
Eighth grade (Education)--Longitudinal studies.