WIA GC/1896/7 | Doren, Alfred to Warburg, Aby 27/01/1896 | one year ago they lived abroad and felt great as sons of a great country; this year, Warburg is... |
WIA GC/1900/23 | Doren, Alfred and Doren, Anna to Warburg, Aby and Warburg, Mary 24/12/1900 | thank [Aby Warburg and Mary Warburg] for their letters, send New Year greetings; Alfred Doren is... |
WIA GC/1901/27 | Doren, Alfred to Warburg, Aby 01/02/1901 | request for Hermann Hirzel photographs of the Villa Böcklin |
WIA GC/1901/4 | Invitation for Böcklin Memorial Ceremony 24/01/1901 | invitation for an Arnold Böcklin memorial ceremony, signed among others by Warburg |
WIA GC/1901/52 | Kurz, Isolde to Warburg, Aby 13/02/1901 | long criticism of his work [on Arnold Böcklin?] |