Columbia subject headings:
United States--Census--Indexes.
United States--Population--History--19th century--Sources--Indexes.
Harvard subject headings:
United States--Census--Indexes.
United States--Indexes.
United States--Population--History--19th century--Sources--Indexes.
Princeton subject headings:
United States--Census--Indexes.
United States--Population--History--19th century--Sources--Indexes.