Columbia subject headings:
Harvard subject headings:
Bohai (Kingdom)
Koguryŏ (Kingdom)
Korea--History--To 935.
Local government--Korea--History
Paekche (Kingdom)
Silla (Kingdom)
Princeton subject headings:
Bohai (Kingdom)
Koguryŏ (Kingdom)
Korea--History--To 935.
Local government--Korea--History.
Paekche (Kingdom)
Silla (Kingdom)