Columbia subject headings:
Korea--Foreign relations--935-1392.
Korea--Foreign relations--Mongolia.
Korea--Politics and government--935-1392.
Mongolia--Foreign relations--Korea.
Mongols--History--To 1500.
Harvard subject headings:
Korea--Foreign relations--935-1392
Korea--Foreign relations--Mongolia.
Korea--Politics and government--935-1392
Mongolia--Foreign relations--Korea.
Mongols--History--To 1500.
Princeton subject headings:
Korea--Foreign relations--Mongolia.
Korea--History--Koryŏ period, 935-1392.
Mongolia--Foreign relations--Korea.
Mongolia--History--To 1500.