Columbia subject headings:
Child care--United States--Statistics.
Children of working mothers--Care--United States--Statistics.
Preschool children--Care--United States--Statistics.
Harvard subject headings:
Child care--United States--Statistics.
Children of working mothers--Care--United States--Statistics.
Preschool children--Care--United States--Statistics.
Princeton subject headings:
Child care--United States--Statistics.
Children of working mothers--Care--United States--Statistics.
Preschool children--Care--United States--Statistics.
Statistics.