WIA FC/1902/9/7 | Warburg, Mary to Warburg, Aby 17/02/1902 | thanks for two letters; encourages him to stay on in Berlin; is pleased to read that Warburg is... |
WIA FC/1902/9/9 | Warburg, Aby to Warburg, Mary 19/02/1902 | likes to receive mail from her; he is working in the library; he has ordered multiple copies of... |
WIA GC/1901/55 | Lippert, Ludwig Julius to Warburg, Aby 06/01/1901 | [enclosure, letter by Heinrich Conradt to Pastor Wilfried Hanne, no longer extant]; he requests... |
WIA GC/1901/56 | Lippert, Ludwig Julius to Warburg, Aby 14/12/1901 | dinner invitation |
WIA GC/1902/279 | Lippert, Ludwig Julius to Warburg, Aby 22/01/1902 | wants to meet Warburg and Momme Nissen in the following week; the sister and mother of his son-in... |