Columbia subject headings:
Families--United States--History.
United States--Social conditions--1865-1918.
United States--Social conditions--20th century.
United States--Social conditions--To 1865.
Harvard subject headings:
Families--United States--History.
United States--Social conditions--1865-1918.
United States--Social conditions--20th century.
United States--Social conditions--To 1865.
Princeton subject headings:
Families--United States--History.
United States--Social conditions--1865-1918.
United States--Social conditions--20th century.
United States--Social conditions--To 1865.