Columbia subject headings:
Agriculture--Russia (Federation)--Ural Mountains Region--History.
Agriculture--Russia (Federation)--Volga River Region--History.
Tatars--History.
Harvard subject headings:
Agriculture--Russia (Federation)--Ural Mountains Region--History.
Agriculture--Russia (Federation)--Volga River Region--History.
Tatars--History
Princeton subject headings:
Agriculture--Russia (Federation)--Ural Mountains Region--History.
Agriculture--Russia (Federation)--Volga River Region--History.
Tatars--History.