WIA GC 1930/3547 | Bing, Gertrud to Warburg, [Paul] 12/08/1930 | |
WIA GC 1930/3685 | Saxl, Fritz to Warburg, Paul M. 27/05/1930 | |
WIA GC 1930/3686 | Bing, Gertrud to Warburg, Paul M. 15/07/1930 | |
WIA GC 1930/3687 | Warburg, Paul M. to Bing, Gertrud 31/07/1930 | |
WIA GC 1930/3688 | Warburg, Paul M. to Saxl, Fritz 28/07/1930 | |