Columbia subject headings:
United States--Economic conditions.
United States--Politics and government--1865-1900.
United States--Social conditions--1865-1918.
Harvard subject headings:
United States--Economic conditions.
United States--Politics and government--1865-1900.
United States--Social conditions--1865-1918.
Princeton subject headings:
United States--Economic conditions.
United States--Politics and government--1865-1900.
United States--Social conditions--1865-1918.