Columbia subject headings:
Harvard subject headings:
Environmental ethics--Germany--Congresses.
Social change--Germany--Congresses.
Sustainable development--Germany--Congresses.
Technology and state--Germany--Congresses.
Princeton subject headings:
Environmental ethics--Germany--Congresses.
Social change--Germany--Congresses.
Sustainable development--Germany--Congresses.
Technology and state--Germany--Congresses.