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/1887/9 | Ruben, Paul to Warburg, Aby 06/10/1887 | on his life and his thoughts on student fraternities ['Bonna Berolina'? cf. 22/11/1928]; he wants... |
WIA GC/1888/11 | Warburg, Aby to Kiesselbach, Wilhelm [1888] | invitation to join [ Max L.] Strack, [Johann Nicolaus] Hertz and Warburg the next day in the pub... |
WIA GC/1888/8 | Hertz, Johann Nicolaus to Warburg, Aby [26/12/1888?] | hopes he will have a good time in Frankfurt; on his trip back to Hamburg with Paul Ruben; on his... |
WIA GC/1889/27 | Hertz, Johann Nicolaus; Melchior, [George]; Ruben, Paul and Strack, Max L. to Warburg, Aby 14/01... | New Year greetings from Hertz [signed Lbf= Leibfuchs], Strack, Melchior and Ruben on the back of... |