Columbia subject headings:
Harvard subject headings:
Archives--Korea.
Diplomatics--Korea.
Korea--History--Koryŏ period, 935-1392--Sources.
Korea--History--To 935--Sources.
Princeton subject headings:
Archives--Korea.
Diplomatics--Korea.
Korea--History--Koryŏ period, 935-l392--Sources.
Korea--History--To 935--Sources.