Columbia subject headings:
Harvard subject headings:
Agriculture and state--Germany--Brandenburg.
Agriculture--Economic aspects--Germany--Brandenburg.
Food supply--Germany--Brandenburg.
Organic farming--Germany--Brandenburg.
Sustainable development--Germany--Brandenburg.
Princeton subject headings:
Agricultural ecology--Germany--Berlin Region.
Agricultural ecology--Germany--Brandenburg.
Organic farming--Germany--Berlin Region.
Organic farming--Germany--Brandenburg.
Sustainable development--Germany--Berlin Region.
Sustainable development--Germany--Brandenburg.