Columbia subject headings:
Cities and towns--United States--Statistics.
Metropolitan areas--United States--Statistics.
United States--Population--Statistics.
Harvard subject headings:
Cities and towns--United States--Statistics
Metropolitan areas--United States--Statistics
Reference works.
United States--Population--Statistics.
Princeton subject headings:
Cities and towns--United States--Statistics.
Statistics.
United States--Census, 1990.
United States--Population--Statistics.