Columbia subject headings:
Tomskai︠a︡ oblastʹ (Russia)--History--20th century--Sources.
Harvard subject headings:
Tomskai︠a︡ oblastʹ (Russia)--History--20th century--Sources.
Princeton subject headings:
Tomskai︠a︡ oblastʹ (Russia)--History--20th century--Sources.