WIA GC/11439 | Warburg, Aby to Ballin, Albert 12/08/1911 | forwards the papers Peter Dorweiler sent to Warburg so that Ballin can inform the Emperor... |
WIA GC/1201 | Sieveking, Hermann Georg to Warburg, Aby 02/06/1903 | supplies a drawing of a wooden crate for the transport of bottles [possibly in connection with... |
WIA GC/19334 | Sieveking, Hermann Georg to Warburg, Aby 04/07/1927 | on an outing by the Verein für hamburgische Geschichte to Celle, the local museum, the convent in... |
WIA GC/19335 | Warburg, Aby to Sieveking, Hermann Georg 05/07/1927 | thanks him for his suggestion; one of Warburg's students comes from Celle and Warburg will... |
WIA GC/19336 | Sieveking, Hermann Georg to Warburg, Aby 07/07/1927 | thanks him for his letter, the birthday greetings and for remembering his help in 1914; enthuses... |