WIA FC/1926/1/3 | Warburg, Aby to Braden, Peter Paul 29/07/1926 | thanks him for his letter and the way his helps Max Adolph; mentions Paul Ruben; on Frede who is... |
WIA GC 1931/2467 | Proctor, Grete to Bing, Gertrud 08/06/1931 | thanks for her letter in which Bing pointed to the fact that there are a number of mistakes in... |
WIA GC 1931/2583 | Ruben, Paul to Saxl, Fritz 19/01/1931 | |
WIA GC 1932/3323 | Wulzinger, Karl to Ruben, Paul 30/11/1932 | |
WIA GC 1933/2482 | Ruben, Paul to Saxl, Fritz 17/09/1933 | |