DELAUNAY Sonia (1885-1979).
L.A.S. "S. Delaunay", Heidelberg 27 September 1924, to Carl EINSTEIN]; 1 page in-4 in blue ink.
She sends Einstein "these notes which my husband has asked me to pass on to you. I am at the moment in Heidelberg and if you want to have some information or explanations about these notes - would you write me here"...
