Columbia subject headings:
Beckmann, Max, 1884-1950--Exhibitions.
Beckmann-Tube, Minna--Portraits--Exhibitions.
Harvard subject headings:
Beckmann, Max, 1884-1950--Exhibitions.
Beckmann-Tube, Minna--Portraits--Exhibitions.
Princeton subject headings:
Beckmann, Max, 1884-1950--Exhibitions.
Beckmann-Tube, Minna--Exhibitions.
Beckmann-Tube, Minna--Portraits--Exhibitions.
Portraits.