Columbia subject headings:
Ecology--Russia (Federation)
Ecology--Russia.
Ecology--Soviet Union.
Russia (Federation)--Population--History.
Russia--Population--History.
Soviet Union--Population--History.
Harvard subject headings:
Human ecology--Russia--History.
Human ecology--Soviet Union--History.
Russia--Population--History.
Soviet Union--Population--History.
Princeton subject headings:
Ecology--Russia (Federation)
Ecology--Russia.
Ecology--Soviet Union.
Russia (Federation)--Population--History.
Russia--Population--History.
Soviet Union--Population--History.