WIA GC/11284 | Warburg, Aby to Marr, Heinz 22/11/1910 | supplies names of people Marr ought to invite as well; [Heinrich?] Embden is prepared to bring... |
WIA GC/7496 | Warburg, Aby to Melchior, Carl 14/01/1914 | he is very grateful to Melchior for his work for von [Wilhelm von] Beckerath; the businessman... |
WIA GC/7497 | Melchior, Carl to Warburg, Aby 15/01/1914 | on the [Wilhelm von] Beckerath foundation; Alfred O'Swald has not paid yet; Warburg's brother... |