WIA GC/1894/12 | Warburg, Aby to Pietsch, Anna 29/10/1894 | congratulates her on her engagement with Alfred Doren; asks her to urge him to work less; gives a... |
WIA GC/1895/3 | Doren, Alfred to Warburg, Aby 26/11/1895 | is angry that he has not heard from Warburg for two months; wonders whether Warburg will receive... |
WIA GC/1896/52 | Pietsch, Anna [?] to Warburg, Aby 14/11/1896 | dinner invitation |
WIA GC/1897/10 | Doren, Alfred to Warburg, Aby 21/08/1897 | his travel to Frankfurt was successful, his friend Ännchen [Anna Pietsch] was received by his... |
WIA GC/1897/11 | Doren, Alfred to Warburg, Aby 30/09/1897 | Congratulations on the forthcoming marriage [Warburg to Mary Hertz]; mentions a wedding present... |