Columbia subject headings:
Harvard subject headings:
Dithmarschen (Germany)--History.
Eiderstedt (Germany)--Genealogy.
Nordfriesland (Germany)--Description and travel.
Nordfriesland (Germany)--History.
Princeton subject headings:
Dithmarschen (Germany)--Description and travel.
Dithmarschen (Germany)--History.
North Friesland (Germany : Region)--Description and travel.
North Friesland (Germany : Region)--History.