WIA GC/1906/173 | du Bois-Reymond, Alard and Lili to Warburg, Aby 03/10/1906 | on the itinerary of their journey and where Warburg could join them |
WIA GC/1907/154 | du Bois-Reymond, Lili to Cécile Leo [?] 30/08/1907 | she is at Kösterberg and has wonderful holidays; describe the Warburg estate, park, villas... |
WIA GC/1908/105 | du Bois-Reymond, Lili to Leo, Cécile [?] 17/02/1908 | she is very happy that [Aby Warburg and Mary Warburg] are in Engelberg; she wants her to meet... |
WIA GC/1909/105 | du Bois-Reymond, Lili to Warburg, Aby 01/03/1909 | everybody was very disappointed that [Aby Warburg and Mary Warburg] did not attend the... |
WIA GC/1909/106 | du Bois-Reymond, Lili to Warburg, Aby 27/05/1909 | thanks Warburg and his wife Mary for their hospitality; compares it Miss von Wertheimstein who... |