WIA GC/10207 | Warburg, Aby to Warburg, Mary 22/10/1904 | detailed account of impressions in Düsseldorf; he met Professor [Eduard] Zacharias, also Jürgens... |
WIA GC/11482 | Warburg, Aby to Rosenthal, Jacques 26/10/1911 | [Jacques] Seligmann honours every business deal; Warburg takes objection to being asked such... |
WIA GC/1455 | Seligmann, Jacques to Warburg, Aby 16/09/1904 | on a query by Warburg about a medal inside a cup |
WIA GC/1456 | Seligmann, Jacques to Warburg, Aby 23/09/1904 | the letter contained an enclosure [no longer extant] describing the medal inside the 'Pedlar and... |
WIA GC/2851 | Seligmann, Jacques to Warburg, Aby 14/10/1907 | encloses photographs of two cassoni |