Vol. 5, 254a. To Alfred Stern[1]
Zurich, 16 February
[1911][2]
[Not selected for translation.]
Vol. 5, 259a. To Heike Kamerlingh Onnes[1]
Zurich, 27 March 1911
[Not selected for translation.]
Vol. 8, 164. From Michele Besso[1]
Krummenau, 11 December 1915
[Not selected for translation.]
Vol. 8, 219a. To Emil Arnold Budde[1]
[Berlin,] 22 May 1916
[Not selected for translation.]
Vol. 8, 227a. From Willem de Sitter
Leyden 7 June 1916 [after 22 June
1916][1]
[Not selected for translation.]
Vol. 9, 343a. To Charlotte Weigert[1]
[Berlin,] 8 March 1920
[Not selected for translation.]
Vol. 9, 352a. To Frieda Huber[1]
[Berlin,] 14 March 1920
[Not selected for translation.]