Columbia subject headings:
Children--United States--Statistics--Congresses.
Families--United States--Statistics--Congresses.
United States--Statistical services--Congresses.
Harvard subject headings:
Children--United States--Congresses.
Children--United States--Statistics--Congresses.
Families--United States--Congresses.
Families--United States--Statistics--Congresses.
United States--Statistical services--Congresses.
Princeton subject headings:
Children--United States--Statistics--Congresses.
Families--United States--Statistics--Congresses.
United States--Statistical services--Congresses.