Columbia subject headings:
Harvard subject headings:
Child development--United States
Education, Preschool--United States--Statistics.
Educational surveys--United States--Statistics.
Educational surveys--United States.
Household surveys--United States--Statistics.
Kindergarten--United States--Statistics.
Preschool children--United States.
Readiness for school--United States--Statistics.
Readiness for school--United States.
Princeton subject headings:
Child development--United States.
Educational surveys--United States.
Preschool children--United States.
Readiness for school--United States.