WIA GC/1908/473 | Seler, Eduard Georg to Warburg, Aby 03/03/1908 | on Warburg's suggestion to establish a reading room for the public; he thinks it is a beautiful... |
WIA GC/1924/189 | Danzel, Theodor-Wilhelm to Warburg, Aby 19/09/1924 | it is only a conjecture that Kolowissi is identical to Quetzalcoatl, but in parts also supported... |