Columbia subject headings:
Harvard subject headings:
Art, Comparative.
Kollwitz, Käthe, 1867-1945--Criticism and interpretation.
Social problems in art.
Viani, Lorenzo, 1882-1936--Criticism and interpretation.
Princeton subject headings:
Kollwitz, Käthe, 1867-1945.
Viani, Lorenzo, 1882-1936.