WIA GC/1899/33 | Oberschulbehörde Hamburg [entrance ticket for Warburg lecture] 08/10/1899 | entrance ticket for the illustrated lecture by Warburg in the Kunsthalle |
WIA GC/1899/34 | Oberschulbehörde Hamburg [memorandum re Warburg lecture] [1899] | memorandum on the need to restrict the huge number of students for admission to the illustrated... |
WIA GC/1899/41 | Klussmann, Heinrich to Warburg, Aby 16/09/1899 | invitation to take part in a meeting to discuss which auditorium would be the most suitable |
WIA GC/1899/42 | Klussmann, Heinrich to Warburg, Aby 21/09/1899 | invitation to take part in a discussion which auditorium would be the most suitable for the... |
WIA GC/1899/43 | Klussmann, Heinrich to Warburg, Aby 18/101899 | informs him on the amount and method of payment for the lectures |