WIA GC/1907/421 | Kirstein, Gustav to Warburg, Aby [1907] | appointment |
WIA GC/1907/51 | Warburg, Aby to Bode, Wilhelm 17/10/1907 | thanks him for information re Richard Muther; he will contact G. Kirstein; on the Richard Muther... |
WIA GC/1909/307 | Warburg, Aby to Kirstein, Gustav 04/08/1909 | when Warburg wrote to Seemann re Hugo Vogel reviews, he did not know what the relationship was... |
WIA GC/1909/538 | Kirstein, Gustav to Warburg, Aby 21/07/1909 | calls Warburg's question inquisitorial; concedes that originally he had planned to publish an... |
WIA GC/1910/329 | Warburg, Aby to Kirstein, Gustav 31/12/1910 | returns New Year greetings; inquires whether the firm can execute a photographic order |