Columbia subject headings:
Harvard subject headings:
Petroleum industry and trade--Russia (Federation)--Siberia, Western.
Petroleum industry and trade--Russia (Federation)--Ti︠u︡menskai︠a︡ oblastʹ.
Princeton subject headings:
Petroleum industry and trade--Russia (Federation)--Siberia, Western.
Petroleum industry and trade--Russia (Federation)--Ti︠u︡menskai︠a︡ oblastʹ.