Columbia subject headings:
Harvard subject headings:
Germany--Social conditions--19th century.
Germany--Social conditions--20th century.
Police--Germany--History--19th century.
Police--Germany--History--20th century.
Princeton subject headings:
Bureaucracy--Germany--History--19th century.
Bureaucracy--Germany--History--20th century.
Police--Germany--History--19th century.
Police--Germany--History--20th century.