Columbia subject headings:
Harvard subject headings:
Democracy--Russia (Federation)--Congresses.
Russia (Federation)--Social conditions--21st century--Congresses.
Social ecology--Russia (Federation)--Congresses.
Socialism--Russia (Federation)--Congresses.
Princeton subject headings:
Human ecology--Russia (Federation)--Congresses.
Industrial ecology--Russia (Federation)--Congresses.
Russia (Federation)--Environmental conditions--Congresses.
Social ecology--Russia (Federation)--Congresses.
Urban ecology (Sociology)--Russia (Federation)--Congresses.