WIA GC/10199 | Borstel, Friedrich von to Warburg, Aby 27/05/1903 | thanks him for a copy of his book |
WIA GC/10287 | Warburg, Aby to Schober, Alfred 17/10/1905 | Warburg had a conversation with [Friedrich] von Borstel; von Borstel knows H.H.A. Fricke and... |
WIA GC/10288 | Warburg, Aby to Borstel, Friedrich von 18/10/1905 | he still has not received a reply from H.H.A. Fricke; asks for Borstel's good services to talk to... |
WIA GC/10289 | Warburg, Aby to Borstel, Friedrich von 18/10/1905 | H.H.A. Fricke has replied to Warburg, summarizing their conversation in which Fricke apologised... |
WIA GC/10290 | Warburg, Aby to Götze, Carl 18/10/1905 | since he received H.H.A. Fricke's apologies in writing, he does not need to take steps officially... |