WIA FC/1928/11/24 | Warburg, Erich to Warburg, Aby 08/10/1928 | thanks him for a copy of Erich Warburg's letter to Felix von Eckardt; Erich Warburg has spoken... |
WIA FC/1928/16/64 | Warburg, Aby to Warburg, Max 25/08/1928 | summarizes the exhibition of the development of modern mathematical-cosmological orientation... |
WIA GC 1930/3462 | [Saxl, Fritz] to Zinn, [Adelbert] Alexander 28/03/1930 | |
WIA GC 1930/3463 | Saxl, Fritz to Zinn, [Adelbert] Alexander 02/04/1930 | |
WIA GC 1930/3464 | Bing, Gertrud to Zinn, [Adelbert] Alexander 14/05/1930 | |