Columbia subject headings:
Harvard subject headings:
Communists--korea.
Korea (North)--Politics and government.
Korea (South)--Politics and government.
Korea--Politics and government--1945-1948.
Korean Demilitarized Zone (Korea)
Korean War, 1950-1953--Atrocities
Tunnel--Korea.
Princeton subject headings:
Korea (North)--Politics and government.
Korea (South)--Politics and government.
Korea--Politics and government--1945-1948.