Columbia subject headings:
Harvard subject headings:
Intelligence service--Japan--History--19th century.
Intelligence service--Japan--History.
Japan--Foreign relations--1600-1868.
Japan--Politics and government--1600-1868.
Japan--Politics and government--19th century.
Nagasaki-shi (Japan)--History--19th century.
Nagasaki-shi (Japan)--History.
National security--Japan--History--19th century.
National security--Japan--History.
Princeton subject headings:
Intelligence service--Japan--History.
Japan--Foreign relations--1600-1868.
Japan--Politics and government--1600-1868.
Nagasaki-shi (Japan)--History.
National security--Japan--History.