Columbia subject headings:
Rhein-Main-Donau-Kanal (Germany)
Harvard subject headings:
Canals--Law and legislation
Canals--Law and legislation--Germany--Rhein-Main-Donau-Kanal.
Maritime law--Germany--Rhein-Main-Donau-Kanal.
Maritime law.
Rhein-Main-Donau-Kanal (Germany)
Princeton subject headings: