Columbia subject headings:
Families--United States--Longitudinal studies.
Social surveys--United States.
United States--Social conditions--1980-2020.
Harvard subject headings:
Families--United States--Longitudinal studies--Congresses.
Social surveys--United States--Congresses.
United States--Social conditions--1980-2020--Congresses
Princeton subject headings:
Families--United States--Longitudinal studies--Congresses.
Social surveys--United States--Congresses.
United States--Social conditions--1980-2020--Congresses.