Columbia subject headings:
Central Chernozem Region (Russia)--Rural conditions--Congresses.
Villages--Russia (Federation)--Central Chernozem Region--History--Congresses.
Harvard subject headings:
Central Chernozem Region (Russia)--Rural conditions--Congresses.
Russia (Federation)--Rural conditions--Congresses.
Villages--Russia (Federation)--Central Chernozem Region--History--Congresses.
Villages--Russia (Federation)--History--Congresses.
Princeton subject headings:
Russia (Federation)--Rural conditions--Congresses.
Villages--Russia (Federation)--History--Congresses.