WIA FC/1925/17/8
Warburg, Aby to Warburg, Max 04/05/1925
forwards copies of seven letters in connection with his efforts re Boll literary estate, [Karl...
WIA FC/1928/16/43
Warburg, Aby to Warburg, Max 03/06/1928
Warburg's considerations on the call by Frankfurt university to E. Cassirer; mentions Kurt...
WIA GC 1930/2982
KBW to Schubring, Walther 15/12/1930
WIA GC 1930/2983
Schubring, Walther to KBW 20/12/1930
WIA GC 1930/3035
KBW to Schubring, Walther 22/12/1930