WIA GC/20913 | Warburg, Aby to Ollendorff, Paul 06/06/1928 | requests information on Oscar Ollendorff, when did he go to Johannisberg, how long did he stay... |
WIA GC/25159 | Warburg, Charlotte to Warburg, Aby 01/09/1885 | thanks him for a letter; is pleased to read that Dr. Bock has received Warburg's portrait... |
WIA GC/25527 | Warburg, Charlotte to Warburg, Aby 22/05/1891 | tells him to write more legibly; the rumour that Günzburgs have to leave Petersburg is not true... |
WIA GC/29634 | Ollendorff, Oscar to Warburg, Aby 14/05/1921 | a letter written in memory of his brother, the medical doctor Ernst Ollendorff, who died 30 years... |
WIA GC/9698 | Ollendorff, Oscar and Ollendorff, Ernst to Warburg, Aby 25/08/1886 | congratulate him on his exam results; they wish him a happy student life |