Columbia subject headings:
Husum (Schleswig-Holstein, Germany)--Intellectual life--Exhibitions.
Petersen, Wilhelm, 1835-1900--Exhibitions.
Harvard subject headings:
Husum (Schlesswig-Holstein, Germany)--Intellectual life--Exhibitions.
Petersen, Wilhelm, 1835-1900--Exhibitions.
Princeton subject headings:
Husum (Schleswig-Holstein, Germany)--Intellectual life--Exhibitions.
Petersen, Wilhelm, 1835-1900--Exhibitions.