Columbia subject headings:
Harvard subject headings:
Intelligence service--Japan--History--20th century.
Japan--Foreign relations--1912-1945
Military intelligence--Japan--History--20th century.
Secret service--Japan--History--20th century.
Princeton subject headings:
Intelligence service--Japan--History--20th century.
Japan--Foreign relations--1912-1945.
Military intelligence--Japan--History--20th century.
Secret service--Japan--History--20th century.