Columbia subject headings:
Harvard subject headings:
Environmental engineering--Europe, Eastern--Periodicals.
Environmental impact analysis--Europe, Eastern--Periodicals.
Environmental policy--Europe, Eastern--Periodicals.
Environmental protection--Economic aspects--Europe, Eastern--Periodicals.
Princeton subject headings:
Ecology--Periodicals.
Ecology--Soviet Union--Periodicals.
Natural history--Soviet Union--Periodicals.
Periodicals.