Columbia subject headings:
Etchers--Germany--Biography.
Nordfriesland (Germany) in art.
Paulsen, Ingwer, 1883-1943.
Harvard subject headings:
Etchers--Germany--Biography.
North Friesland (Germany : Region) in art.
Paulsen, Ingwer, 1883-1943.
Princeton subject headings:
Paulsen, Ingwer, 1883-1943.