Columbia subject headings:
Environmental policy--Soviet Union--Congresses.
Pollution--Soviet Union--Congresses.
Property--Soviet Union--Congresses.
Harvard subject headings:
Environmental policy--Soviet Union--Congresses.
Pollution--Soviet Union--Congresses.
Property--Soviet Union--Congresses.
Princeton subject headings:
Environmental policy--Soviet Union--Congresses.
Pollution--Soviet Union--Congresses.
Property--Soviet Union--Congresses.