Columbia subject headings:
Brücke-Museum--Catalogs.
Heckel, Erich, 1883-1970--Catalogs.
Harvard subject headings:
Brücke-Museum--Catalogs.
Heckel, Erich, 1883-1970--Catalogs.
Princeton subject headings:
Heckel, Erich, 1883-1970--Catalogs.