Columbia subject headings:
United States--Politics and government--1963-1969--Congresses.
United States--Social conditions--1960-1980--Congresses.
Harvard subject headings:
United States--Politics and government--1963-1969--Congresses.
United States--Social conditions--1960-1980--Congresses.
Princeton subject headings:
United States--Politics and government--1963-1969--Congresses.
United States--Social conditions--1960-1980--Congresses.