Columbia subject headings:
United States--Census, 1870.
United States--Economic conditions.
United States--Population.
United States--Statistics, Vital.
Harvard subject headings:
United States--Census, 1870.
United States--Economic conditions.
United States--Population.
United States--Statistics, Vital.
Princeton subject headings:
United States--Census, 1870.
United States--Economic conditions.
United States--Population.
United States--Statistics, Vital.