Columbia subject headings:
Harvard subject headings:
Hijacking of ships--Germany--Prevention--History.
Piracy--Europe--History.
Piracy--Europe--Prevention--History.
Piracy--Forecasting.
Piracy--Germany--Safety measures--Forecasting.
Piracy--Germany--Safety measures--History.
Piracy--History.
Piracy--Political aspects--Germany.
Princeton subject headings:
Hijacking of ships--Germany--Prevention--History.
Piracy--Europe--History.
Piracy--Europe--Prevention--History.
Piracy--Forecasting.
Piracy--Germany--Safety measures--Forecasting.
Piracy--Germany--Safety measures--History.
Piracy--History.
Piracy--Political aspects--Germany.