WIA FC/1923/12/2 | Warburg, Mary to Warburg, Frede 31/07/1923 | is staying at Kösterberg for a few days, there are no guests in her own house and there is space... |
WIA GC/1907/157 | Du Bois-Reymond, Lili to Warburg, Mary 17/10/1907 | news of friends and life in her house; mentions Wilhelm Hertz [Mary's brother], Tycho, who is the... |