WIA GC/1901/48 | Hornbostel, Erich Moritz von to Warburg, Aby 25/09/1901 | thanks him for guidance in his profession; plans to engage in some medical studies on the margins... |
WIA GC/1902/200 | Hornbostel, Erich Moritz von to Warburg, Aby 06/03/1902 | thanks him very much for receiving a copy of Warburg's book, 'Bildniskunst' |
WIA GC/1902/321 | Wolfhagen, G. to Warburg, Aby 24/02/1902 | list of people who were sent copies of Warburg's article 'Bildniskunst', 18 in Germany, 15 in... |
WIA GC/1906/338 | Hornbostel, Erich Moritz von to Warburg, Aby 16/11/1906 | greetings from 'among the Indians' |
WIA GC/1906/486 | Mooney, James to Warburg, Aby 14/12/1906 | Erich von Hornbostel spoke of Warburg to him; Christmas greetings |