Columbia subject headings:
Art historians--Germany--Correspondence.
Harvard subject headings:
Art historians--Germany--Correspondence.
Saxl, Fritz, 1890-1948--Correspondence.
Warburg, Aby, 1866-1929--Correspondence.
Princeton subject headings:
Art historians--Germany--Correspondence.
Saxl, Fritz, 1890-1948--Correspondence.
Warburg, Aby, 1866-1929--Correspondence.