WIA FC/1906/12/22 | Warburg, Max to Warburg, Aby 29/08/1906 | [Edaourd] Noetzlin [honorary president of the Banque de Paris et des Pays Bas] will have contacts... |
WIA GC/1906/374 | Koechlin, Raymond to Warburg, Aby 14/10/1906 | arranges an appointment |
WIA GC/1906/375 | Koechlin, Raymond to Warburg, Aby [19/10/1906] | changes time of the appointment |
WIA GC/1906/376 | Koechlin, Raymond to Warburg, Aby [22/10/1906] | thanks him for an essay |
WIA GC/1906/377 | Koechlin, Raymond to Warburg, Aby [16/11/1906] | on the subject of the woodcutting peasants |