WIA GC/1900/87 | Steffen, Gustaf F. to Warburg, Aby 03/09/1900 | thanks him for the book by Zwiedineck-Südenhorst 'Lohnpolitik und Lohntheorie'; on his plans for... |
WIA GC/1900/88 | Steffen, Gustaf F., Steffen, Oscara and Ehrenberg, Richard to Warburg, Aby and Warburg, Mary 22... | New Year Greetings |
WIA GC/1900/89 | Steffen, Gustaf F. to Warburg, Aby 25/12/1900 | went to Florence, but missed him; sends New Year greetings and wants to meet him in the spring to... |
WIA GC/1901/97 | Steffen, Gustaf F. to Warburg, Aby 06/03/1901 | informs him that he is going to Hamburg and then on to Florence; asks him whether he can do... |
WIA GC/1901/98 | Steffen, Gustaf F. to Warburg, Aby 24/12/1901 | Christmas greetings |