WIA GC/1905/208 | Guba, Rudolf to Warburg, Aby 28/08/1905 | asks for an appointment; [Walter] Voltmer will have sent a reference to Warburg in the meantime |
WIA GC/1905/209 | Guba, Rudolf to Warburg, Aby 03/09/1905 | forwards the reference by Mr. [Walter] Voltmer; change of appointment |
WIA GC/1905/628 | Voltmer, Walter to Warburg, Aby 15/07/1905 | agrees to teach Rudolf Guba |
WIA GC/1905/629 | Voltmer, Walter to Warburg, Aby 02/09/1905 | reference for Rudolf Guba who made steady progress whilst studying with Voltmer during the summer... |
WIA GC/1906/277 | Warburg, Aby to Guba, Anton 29/09/1906 | his son had not paid Mr. [Walter] Voltmer, the painting teacher, although he maintained he had... |