Columbia subject headings:
Early childhood education--United States--Longitudinal studies.
Educational surveys--United States.
Kindergarten--United States--Longitudinal studies.
Harvard subject headings:
Educational surveys--United States.
Kindergarten--United States--Longitudinal studies.
Kindergarten--United States--Statistics.
Princeton subject headings:
Early childhood education--United States--Longitudinal studies.
Educational surveys--United States.
Kindergarten--United States--Longitudinal studies.