Columbia subject headings:
Harvard subject headings:
Causeways--Germany--Hindenburgdamm--Design and construction--History.
Causeways--Germany--Hindenburgdamm--History.
Hindenburgdamm (Germany)--History.
Railroads--Germany--Hindenburgdamm--Design and construction--History.
Railroads--Germany--Hindenburgdamm--History.
Railroads--Germany--Sylt--History.
Princeton subject headings:
Causeways--Germany--Hindenburgdamm--Design and construction--History.
Causeways--Germany--Hindenburgdamm--History .
Hindenburgdamm (Germany)--History.
Railroads--Germany--Hindenburgdamm--Design and construction--History.
Railroads--Germany--Hindenburgdamm--History .
Railroads--Germany--Sylt--History .