Columbia subject headings:
Kollwitz, Käthe, 1867-1945--Exhibitions.
Modersohn-Becker, Paula, 1876-1907--Exhibitions.
Harvard subject headings:
Kollwitz, Käthe, 1867-1945--Exhibitions.
Modersohn-Becker, Paula, 1876-1907--Exhibitions.
Princeton subject headings:
Kollwitz, Käthe, 1867-1945--Exhibitions.
Modersohn-Becker, Paula, 1876-1907--Exhibitions.