WIA GC 1930/1407 | KBW to Hartz, Otto 01/04/1930 | |
WIA GC/1887/10 | Ruben, Paul to Warburg, Aby 15/10/1887 | mentions Ernst Levy, Wilhelm Kiesselbach, John [Johann Nicolaus] Hertz, Johannes [Hans] Nippen... |
WIA GC/1888/7 | Hartz, Otto to Warburg, Aby 03/10/1888 | sends greetings; he is with his mother in Bonn; Carl Justi's book on [Diego Rodriguez de Silva y... |
WIA GC/1889/13 | Hartz, Otto to Warburg, Aby 10/05/1889 | thanks him for a letter; detailed account of whom he met in the last few days, Paul Ruben... |
WIA GC/1889/14 | Hartz, Otto and Ruben, Paul to Warburg, Aby 12/06/1889 | birthday greetings from Hartz and 'beer witness' Paulus |