Columbia subject headings:
City and town life--Korea (South)--Seoul.
City walls--Conservation and restoration--Korea (South)--Seoul.
City walls--Korea (South)--Seoul--History.
Fortification--Korea (South)--Seoul--History.
Harvard subject headings:
City walls--Korea (South)--Seoul--History.
Fortification--Korea (South)--Seoul--History.
Seoul (Korea)--History.
Princeton subject headings: