Columbia subject headings:
Koguryŏ (Kingdom)--Civilization.
Korea--Historical geography.
Korea--History--Errors, inventions, etc.
Korea--History--To 935--Historiography.
Harvard subject headings:
Koguryŏ (Kingdom)--Historical geography.
Koguryŏ (Kingdom)--Territories and possessions.
Korea--History--Errors, inventions, etc.
Korea--History--To 935--Historiography
Princeton subject headings:
Koguryŏ (Kingdom)--Historical geography.
Koguryŏ (Kingdom)--Territories and possessions.
Korea--History--Errors, inventions, etc.
Korea--History--To 935--Historiography.