WIA GC/17841 | Nippen, Hans to Warburg, Aby 24/04/1926 | Warburg told him that Paul [Ruben] was celebrating his 60th birthday; sends birthday greetings... |
WIA GC/17842 | Warburg, Aby to Nippen, Hans 26/04/1926 | Paul Ruben's birthday went well; he cannot help him with organising the congress as he will be... |
WIA GC/25178 | Warburg, Aby to Warburg, Charlotte 25/10/1886 | he would have replied earlier but he made a trip to Ahrtal [Ahr is a tributary of the Rhine... |
WIA GC/25202 | Warburg, Aby to Warburg, Charlotte 05/01/1887 | he has returned from Frankfurt on 03/01/1887; he has already met up with [Hans] Nippen and [Felix... |
WIA GC/25216 | Warburg, Aby and Warburg, Moritz to Warburg, Charlotte 11/05/1887 | Warburg thanks his mother for a letter; he is well; he has 27 lecture hours per week including... |