WIA GC/10634 | Warburg, Aby to Strzygowski, Josef 09/06/1907 | informs him that he sent out the programme for the congress to: Sidney Colvin, C. Dodgson in... |
WIA GC/10645 | Warburg, Aby to Strzygowski, Josef 15/06/1907 | informs him that he had replies by Georg Gronau, R. Koechlin, Jan Kalf, J. Destrée; asks whether... |
WIA GC/10646 | Warburg, Aby to Strzygowski, Josef 22/06/1907 | Warburg lists receipt of replies; Joseph Destrée, Brussels; Jan Kalf, The Hague; Andreas Aubert... |
WIA GC/1078 | Kalf, Jan to Warburg, Aby 06/05/1903 | in reply to Warburg's request he sends him bibliographical information on Dutch folkloristic... |
WIA GC/11486 | Warburg, Aby to Kalf, Jan 02/11/1911 | because of Mrs. Warburg's illness they had to leave The Hague early; he could not collect his... |