Columbia subject headings:
Architecture--Germany--Hagen (Arnsberg)--History--20th century--Exhibitions.
City planning--Germany--Hagen (Arnsberg)--History--20th century--Exhibitions.
Hagen (Arnsberg, Germany)--Buildings, structures, etc.--Exhibitions.
Harvard subject headings:
Architecture, Modern--21st century
Architecture--Germany--20th century--Exhibitions
City planning--Germany
Princeton subject headings: