Columbia subject headings:
Harvard subject headings:
Hotels--England--London--History--20th century.
Hotels--Germany--Berlin--History--20th century.
Hotels--New York (State)--New York--History--20th century.
Luxuries--England--London--History--20th century.
Luxuries--Germany--Berlin--History--20th century.
Luxuries--New York (State)--New York--History--20th century.
Sociology, Urban--England--London--History--20th century.
Sociology, Urban--Germany--Berlin--History--20th century.
Sociology, Urban--New York (State)--New York--History--20th century.
Princeton subject headings:
Hotels--England--London--History--20th century.
Hotels--Germany--Berlin--History--20th century.
Hotels--New York (State)--New York--History--20th century.
Luxuries--England--London--History--20th century.
Luxuries--Germany--Berlin--History--20th century.
Luxuries--New York (State)--New York--History--20th century.
Sociology, Urban--England--London--History--20th century.
Sociology, Urban--Germany--Berlin--History--20th century.
Sociology, Urban--New York (State)--New York--History--20th century.