Columbia subject headings:
Harvard subject headings:
Artists--Germany--Correspondence.
Beckmann, Max, 1884-1950--Correspondence.
Beckmann-Tube, Minna--Correspondence.
World War, 1914-1918--Personal narratives, German
Princeton subject headings:
Beckmann, Max, 1884-1950.
World War, 1914-1918--Personal narratives, German.