Columbia subject headings:
Korea (North)--Social conditions--21st century.
Korea--History--1864-1910.
Korea--History--1945-
Korea--History--Japanese occupation, 1910-1945.
Harvard subject headings:
Korea--History--20th century.
Korea--History--21st century.
Korea--Politics and government--20th century.
Korea--Politics and government--21st century.
Princeton subject headings: