WIA FC/1928/16/14 | Warburg, Aby to Warburg, Max 10/03/1928 | thanks him for letter of recommendation to solicitor R. Isay; in Berlin he will talk a, to... |
WIA FC/1928/8/54 | Warburg, Aby to Warburg, Mary 11/11/1928 | sends greetings to the bridal couple [Ruth Derenberg]; requests a letter by [Ludwig Heinrich... |
WIA FC/1929/16/9 | Warburg, Aby to Warburg, Max 25/03/1929 | is pleased that H. Eckener remembers Warburg so well; accepts Max Warburg's view of Carl [Wilhelm... |
WIA FC/1929/7/114 | Warburg, Aby to Warburg, Mary 12/06/1929 | describes their visit to Bernard Berenson; likes his villa; [Ludwig] Heinrich Heydenreich also... |
WIA GC 1930/1478 | Heydenreich, Ludwig to Hertz, Clara 30/01/1930 | |