Columbia subject headings:
Harvard subject headings:
China--Foreign relations--Japan.
China--Foreign relations--Korea.
Japan--Foreign relations--China.
Japan--Foreign relations--Korea.
Korea--Foreign relations--China.
Korea--Foreign relations--Japan.
Korea--History--Japanese Invasions, 1592-1598.
Princeton subject headings:
China--Foreign relations--Japan.
China--Foreign relations--Korea.
Japan--Foreign relations--China.
Japan--Foreign relations--Korea.
Korea--Foreign relations--China.
Korea--Foreign relations--Japan.
Korea--History--Japanese Invasions, 1592-1598.