WIA GC/11867 | Petersen, G. to Warburg, Aby 02/09/1920 | refers to Warburg's Last Will, dated 14/09/1917 and kept in the safe of his office; the codicil... |
WIA GC/11868 | Petersen, G. to Warburg, Aby 20/09/1920 | forwards draft of new Last Will; he discussed it with Warburg's brother-in-law, Wilhelm Hertz... |
WIA GC/22104 | Wolffheim, Werner to Warburg, Aby 01/01/1928 | Dessoir told him that he raised the topic of the sale of Wollfheimer's music library with Warburg... |