Columbia subject headings:
Harvard subject headings:
Agriculture--Economic aspects--Russia (Federation)--Central Chernozem Region--Congresses.
Central Chernozem Region (Russia)--Rural conditions--Congresses.
Central Chernozem Region (Russia)--Social conditions--Congresses.
Peasants--Russia (Federation)--Central Chernozem Region--Congresses.
Princeton subject headings:
Agriculture--Economic aspects--Russia (Federation)--Central Chernozem Region--Congresses.
Central Chernozem Region (Russia)--Rural conditions--Congresses.
Central Chernozem Region (Russia)--Social conditions--Congresses.
Peasants--Russia (Federation)--Central Chernozem Region--Congresses.