Columbia subject headings:
Harvard subject headings:
Public opinion--United States
Social surveys--United States.
United States--Politics and government--1993-2001--Public opinion.
United States--Social conditions--1980-2020--Public opinion
Princeton subject headings:
Public opinion--United States.
Social surveys--United States.
United States--Politics and government--1993-2001.
United States--Social conditions--1980-2020.