WIA GC/1893/16 | Maass, Ernst to Warburg, Aby 17/07/1893 | he needs [Adolphe?] Braun's permission to forward the 'Primavera' plate to Friedrich Bruckmann... |
WIA GC/1893/17 | Maass, Ernst to Warburg, Aby 27/07/1893 | F. Bruckmann [Verlagsanstalt F. Bruckmann A.-G.] informed him that he no longer needed the... |
WIA GC/1905/343 | Maass, Ernst to Warburg, Aby 28/03/1905 | Warburg is asked to propose the toast at the Founder's Day celebration of the Hamburg historical... |
WIA GC/1905/344 | Maass, Ernst to Warburg, Aby 28/04/1905 | the 'Naturwissenschaftliche Verein', society for science, and the 'Geographische Gesellschaft... |
WIA GC/1905/345 | Maass, Ernst to Warburg, Aby 19/06/1905 | asks him whether he has carried out what he promised, to make a list of participants, to write to... |