Columbia subject headings:
Architecture--Germany--Freiburg im Breisgau.
Harvard subject headings:
Architecture, Modern--21st century
Architecture--Germany--Freiburg im Breisgau.
Freiburg im Breisgau (Germany)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Modern--20th century.
Architecture, Modern--21st century.
Architecture--Germany--Freiburg im Breisgau.
Freiburg im Breisgau (Germany)--Buildings, structures, etc.