Columbia subject headings:
United States--Census, 1990.
United States--Economic conditions--1981-2001--Statistics.
United States--Population--Statistics.
United States--Social conditions--1980-2020--Statistics.
Harvard subject headings:
Princeton subject headings:
Statistics.
United States--Census, 1990.
United States--Economic conditions--1981---Statistics.
United States--Population--Statistics.
United States--Social conditions--1980-2020--Statistics.