| Ref No | WIA GC/12517 |
| Title | Warburg, Aby to Boysen, Christian 15/01/1920 |
| Writer | Warburg, Aby |
| Recipient | Boysen, [Christian] |
| Place2 | Hamburg |
| Date | 15/01/1920 |
| Format | typescript |
| Contents | as a client for many years, Warburg requests that the bookdealer does not demand the full 20 % surcharge on books, but only 10 % |
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