Columbia subject headings:
Hotels--Europe--History--19th century.
Hotels--Europe--History--20th century.
Harvard subject headings:
Bars (Drinking establishments)--Europe--History--19th century.
Bars (Drinking establishments)--Europe--History--20th century.
Bars (Drinking establishments)--United States--History--19th century.
Bars (Drinking establishments)--United States--History--20th century.
Hotels--Europe--History--19th century.
Hotels--Europe--History--20th century.
Hotels--United States--History--19th century.
Hotels--United States--History--20th century.
Princeton subject headings:
Hotels--Europe--History--19th century.
Hotels--Europe--History--20th century.
Hotels--United States--History--19th century.
Hotels--United States--History--20th century.