Columbia subject headings:
Art brut--Switzerland--Bern.
Wölfli, Adolf, 1864-1930--Criticism and interpretation.
Harvard subject headings:
Art brut--Switzerland.
Case studies
Wölfli, Adolf, 1864-1930--Criticism and interpretation.
Princeton subject headings:
Art brut--Switzerland.
Wölfli, Adolf, 1864-1930--Criticism and interpretation.