Columbia subject headings:
United States--Economic conditions--1961-1971.
United States--Race relations.
United States--Social conditions--1945-
Harvard subject headings:
United States--Economic conditions--1961-1971.
United States--Race relations
United States--Social conditions--1945-
Princeton subject headings:
United States--Economic conditions--1961-1971.
United States--Race relations.
United States--Social conditions--1945-