Columbia subject headings:
City planning--Environmental aspects--Germany--Freiburg im Breisgau.
Sustainable urban development--Germany--Freiburg im Breisgau.
Harvard subject headings:
City planning--Environmental aspects--Germany--Freiburg im Breisgau.
Sustainable urban development--Germany--Freiburg im Breisgau.
Princeton subject headings:
City planning--Environmental aspects--Germany--Freiburg im Breisgau.
Sustainable urban development--Germany--Freiburg im Breisgau.