WIA GC/1905/4 | Baerwald, Olli to Warburg, Aby and Warburg, Mary 02/03/1905 | thanks them for their expression of condolence on the death of her mother; wishes to meet them |
WIA GC/1907/8 | Baerwald, Olli and Baerwald, Richard to Warburg, Aby and Warburg, Mary 30/12/1907 | New Year greetings; they plan to spend the next hayfever season in Norway |