Columbia subject headings:
Harvard subject headings:
China--Foreign relations--Korea.
Korea--Foreign relations--China.
Korea--History--Chosŏn dynasty, 1392-1910.
Korea--History--Koryŏ period, 935-1392.
Princeton subject headings:
China--Foreign relations--Korea--History.
Korea--Foreign relations--China--History.
Korea--History--Koryŏ period, 935-1392.