Columbia subject headings:
Architecture, Modern--20th century.
Freiburg im Breisgau (Germany)--Buildings, structures, etc.
Harvard subject headings:
Princeton subject headings:
Architecture, Modern--20th century--Germany (West)--Freiburg im Breisgau.
Architecture--Germany (West)--Freiburg im Breisgau.
Freiburg im Breisgau (Germany)--Buildings.