Columbia subject headings:
Eavesdropping--Germany (West)
Telecommunication--Law and legislation--Germany (West)
Wiretapping--Germany (West)
Harvard subject headings:
Eavesdropping--Germany (West)
Telecommunication--Law and legislation--Germany (West)
Wiretapping--Germany (West)
Princeton subject headings:
Eavesdropping--Germany (West).
Telecommunication--Law and legislation--Germany (West)
Wiretapping--Germany (West).