WIA GC/1908/397 | Oetiker, [Anna und Friedrich?] to Warburg, Aby and Mary 02/03/1908 | thanks him for communication; du Bois-Reymond left; there is a great deal of snow |
WIA GC/1908/398 | Oetiker, [Friedrich?] to Warburg, Aby 20/02/1908 | [German dialect poem praising fair maiden] |
WIA GC/1908/399 | Oetiker, [Friedrich?] to Warburg, Aby [1908] | poem [reworded text of an aria in The Magic Flute] |
WIA GC/1908/550 | Wulff, Oskar to Warburg, Aby 13/02/1908 | he is still undecided whether or not to join the 'Deutsche Verein'; he has no time, his wife... |
WIA GC/1925/825 | Lenel, Walter to Warburg, Aby 11/06/1925 | tells him that Max Adolph paid him a visit and told him of Warburg's stay in Baden-Baden; is... |