Columbia subject headings:
Civil defense--Japan--Tokyo--History--19th century.
Civil defense--Japan--Tokyo--History--20th century.
Emergency management--Japan--Tokyo--History--20th century.
Internal security--Japan--Tokyo--History--19th century.
Internal security--Japan--Tokyo--History--20th century.
Tokyo (Japan)--Politics and government--19th century.
Tokyo (Japan)--Politics and government--20th century.
Harvard subject headings:
Civil defense--Japan--Tokyo--History--19th century.
Civil defense--Japan--Tokyo--History--20th century.
Civil defense--Japan--Tokyo.
Emergency management--Japan--Tokyo--History--20th century.
Emergency management--Japan--Tokyo.
Internal security--Japan--Tokyo--History--19th century.
Internal security--Japan--Tokyo--History--20th century.
Tokyo (Japan)--History
Tokyo (Japan)--Politics and government--19th century.
Tokyo (Japan)--Politics and government--20th century.
Princeton subject headings:
Civil defense--Japan--Tokyo.
Emergency management--Japan--Tokyo.
Tokyo (Japan)--Defenses.
Tokyo (Japan)--History.