Columbia subject headings:
Harvard subject headings:
Eider River (Germany)--History.
Eider River Region (Germany)--History.
Landscapes--Germany--Eider River Region--History.
Rivers--Germany--Schleswig-Holstein--History.
Princeton subject headings:
Eider River (Germany)--History.
Eider River Region (Germany)--History.
Landscapes--Germany--Eider River Region--History.
Rivers--Germany--Schleswig-Holstein--History.