Columbia subject headings:
Harvard subject headings:
Consumer behavior--Germany (East)--Exhibitions.
Plastics industry and trade--Germany (East)--Exhibitions.
Plastics--Environmental aspects--Germany (East)--Exhibitions.
Princeton subject headings:
Consumer behavior--Germany (East)--Exhibitions.
Plastics industry and trade--Germany (East)--Exhibitions.
Plastics--Environmental aspects--Germany (East)--Exhibitions.