Columbia subject headings:
Korea--History--Koryŏ period, 935-1392--Historiography.
Korea--Politics and government--935-1392.
Natural disasters--Koryŏ period, 935-1392--Historiography.
Harvard subject headings:
Korea--History--Koryŏ period, 935-1392--Historiography.
Korea--Politics and government--935-1392.
Natural disasters--Koryŏ period, 935-1392--Historiography.
Princeton subject headings:
Confucianism and state--Korea--History--To 1500.
Korea--Politics and government--935-1392.
Natural disasters--Political aspects--Korea--History--To 1500.