Columbia subject headings:
Harvard subject headings:
Criminal investigation--Germany (West)--History.
Criminal investigation--Germany--History--20th century.
Police communication systems--Germany (West)--History.
Police communication systems--Germany--History--20th century.
Police--Germany (West)--History.
Police--Germany--History--20th century.
Princeton subject headings:
Criminal investigation--Germany (West)--History.
Criminal investigation--Germany--History--20th century.
Police communication systems--Germany (West)--History.
Police communication systems--Germany--History--20th century.
Police--Germany (West)--History.
Police--Germany--History--20th century.