WIA GC/1898/48 | Osten, A. von der to Warburg, Aby 21/03/1898 | supplies address of Dr. Eisenbart in Buffalo, US, c/o Harold Hayes, a hay fever specialist... |
WIA GC/1903/1 | Becker, Bianca Emilie to Warburg, Aby 14/10/1903 | thanks Herr A. von der Osten for forwarding a letter by Warburg re translation of 'lettere... |
WIA GC/1903/214 | Osten, A. von der to Warburg, Aby 10/10/1903 | in September he and Warburg discussed a project, the translation of the 'lettere di una gentil... |
WIA GC/1903/215 | Osten, A. von der to Warburg, Aby 12/10/1903 | thanks him for his reply which he sent on to Miss Milly Becker [Bianca Emilie Rohland-Becker... |
WIA GC/1905/15 | Becker, Mathilde to Warburg, Aby 06/04/1905 | she is forwarding all mail to her friend [A. von der] Osten; confesses that she opened Warburg's... |