Columbia subject headings:
Police--Great Britain--History--18th century--Sources.
Police--Great Britain--History--19th century--Sources.
Police--Great Britain--History--20th century--Sources.
Harvard subject headings:
Princeton subject headings:
Police--Great Britain--History--18th century--Sources.
Police--Great Britain--History--19th century--Sources.
Police--Great Britain--History--20th century--Sources.