Columbia subject headings:
Harvard subject headings:
DHL Express (Firm)--History.
Deutsche Post--History.
Express service--Germany--History.
Postal service--Germany--History
Telecommunication--Germany--History.
Princeton subject headings:
DHL Express (Firm)--History.
Deutsche Post--History.
Express service--Germany--History.
Postal service--Germany--History.
Telecommunication--Germany--History.