WIA GC/12442 | Warburg, Aby to Grautoff, Otto 03/02/1918 | he enjoyed reading his article in NAZ [Norddeutsche Allgemeine Zeitung?] and agrees with him... |
WIA GC/8935 | Grautoff, Otto to Warburg, Aby 06/03/1918 | he was very impressed with [Paul] Clemen's art historical institute in Bonn; he wants to visit... |