Columbia subject headings:
Harvard subject headings:
Coast defenses--Japan--History--17th century.
Coast defenses--Japan--History--18th century.
Japan--Foreign relations--1600-1868.
Japan--Politics and government--1600-1868.
Princeton subject headings:
Coast defenses--Japan--History.
Japan--Foreign relations--1600-1868.
Japan--Politics and government--1600-1868.