Columbia subject headings:
Beuys, Joseph--Criticism and interpretation.
Watercolor painting--Themes, motives.
Harvard subject headings:
Beuys, Joseph--Catalogues raisonnés.
Beuys, Joseph--Criticism and interpretation.
Watercolor painting--Themes, motives.
Princeton subject headings:
Beuys, Joseph--Catalogues raisonnés.
Beuys, Joseph.
Watercolor painting, German--Germany.
Watercolor painting--20th century.