Columbia subject headings:
Ecology--Russia (Federation)--Samarskai︠a︡ oblastʹ.
Natural resources--Russia (Federation)--Samarskai︠a︡ oblastʹ.
Samarskai︠a︡ oblastʹ (Russia)--Description and travel.
Harvard subject headings:
Kuĭbyshevskai︠a︡ oblastʹ (Russia)--Description and travel.
Natural resources--Russia (Federation)--Samarskai︠a︡ oblastʹ.
Princeton subject headings: