Columbia subject headings:
Harvard subject headings:
Artist couples--Germany--Exhibitions.
Beckmann, Max, 1884-1950--Exhibitions.
Beckmann, Max, 1884-1950. Correspondence--Exhibitions.
Beckmann-Tube, Minna--Correspondence--Exhibitions.
Princeton subject headings:
Artists--Germany--Correspondence.
Beckmann, Max, 1884-1950--Correspondence--Exhibitions.
Beckmann, Max, 1884-1950--Exhibitions.
Beckmann-Tube, Minna--Correspondence--Exhibitions.
Beckmann-Tube, Minna--Portraits--Exhibitions.
Portraits.