Columbia subject headings:
Harvard subject headings:
China--Foreign relations--Korea--Sources.
Korea--Foreign relations--China--Sources.
Korea--History--Japanese Invasions, 1592-1598.
Military assistance, Chinese--Korea--History.
Princeton subject headings:
China--Foreign relations--Korea--Sources.
Korea--Foreign relations--China--Sources.
Korea--History--Japanese Invasions, 1592-1598.
Military assistance, Chinese--Korea--History.