Columbia subject headings:
Harvard subject headings:
Europe--Social life and customs--19th century.
United States--Social life and customs--19th century.
Upper class--Europe--History--19th century.
Upper class--United States--History--19th century.
Princeton subject headings:
Europe--History--1871-1918.
Europe--Social life and customs.
United States--History--1865-1921.
United States--Social life and customs--1865-1918.
Upper class--Europe--History.
Upper class--United States--History.