Columbia subject headings:
Harvard subject headings:
Fortification--Korea
Japan--Civilization--Korean influences.
Koguryŏ (Kingdom)--Civilization.
Korea--Antiquities.
Tombs--Korea
Princeton subject headings:
Fortification--Korea.
Japan--Civilization--Korean influences.
Koguryŏ (Kingdom)--Civilization.
Korea--Antiquities.
Tombs--Korea.