Columbia subject headings:
Harvard subject headings:
Cities and towns--Ratings and rankings--European Union countries--History--21st century.
European Union countries--Cultural policy--History--21st century.
Festivals--Government policy--Germany--Ruhr (Region)--History--21st century.
Multiculturalism--Germany--Ruhr (Region)--History--21st century.
Ruhr (Germany : Region)--Cultural policy--History--21st century.
Princeton subject headings:
Cities and towns--Ratings and rankings--European Union countries--History--21st century.
European Union countries--Cultural policy--History--21st century.
Festivals--Government policy--Germany--Ruhr (Region)--History--21st century.
Multiculturalism--Germany--Ruhr (Region)--History--21st century.
Ruhr (Germany : Region)--Cultural policy--History--21st century.