Columbia subject headings:
Harvard subject headings:
Hokkaido (Japan)--History--Congresses.
Sakhalin (Sakhalinskai︠a︡ oblastʹ, Russia)--History--Congresses.
Princeton subject headings:
Hokkaido (Japan)--History--Congresses.
Sakhalin (Sakhalinskai︠a︡ oblastʹ, Russia)--History--Congresses.