Columbia subject headings:
Harvard subject headings:
Mumenthaler, Ernst--Art collections--Exhibitions.
Mumenthaler-Fischer, Maria Elisabeth--Art collections--Exhibitions.
Wölfli, Adolf, 1864-1930--Exhibitions.
Öffentliche Kunstsammlung Basel. Kupferstichkabinett--Exhibitions.
Princeton subject headings:
Drawing--Private collections--Switzerland--Exhibitions.
Mumenthaler, Ernst--Art collections--Exhibitions.
Öffentliche Kunstsammlung Basel. Kupferstichkabinett--Exhibitions.
Wölfli, Adolf, 1864-1930--Exhibitions.