Columbia subject headings:
Harvard subject headings:
Natural gas--Russia (Federation)--Ti︠u︡menskai︠a︡ oblastʹ.
Petroleum--Russia (Federation)--Ti︠u︡menskai︠a︡ oblastʹ.
Ti︠u︡menskai︠a︡ oblastʹ (Russia)--Economic conditions.
Princeton subject headings:
Natural gas--Russia (Federation)--Ti︠u︡menskai︠a︡ oblastʹ.
Petroleum--Russia (Federation)--Ti︠u︡menskai︠a︡ oblastʹ.
Ti︠u︡menskai︠a︡ oblastʹ (Russia)--Economic conditions.