WIA GC/1905/426 | Warburg, Aby to Obst, Arthur (Hamburger Fremdenblatt) 08/10/1905 | [Karl] Dissel asked him to forward a copy of his Dürer lecture to the 'Hamburger Fremdenblatt... |
WIA GC/1912/752 | Warburg, Aby to Obst, Arthur 02/03/1912 | thanks him for a copy of the newspaper with Warburg's photograph; where did they get the... |
WIA GC/1912/753 | Obst, Arthur to Warburg, Aby 04/03/1912 | congratulates him on the title Professor; admits that he himself had expressed the view that... |
WIA GC/1912/754 | Warburg, Aby to Obst, Arthur 27/10/1912 | [illegible] |
WIA GC/1912/755 | Obst, Arthur to Warburg, Aby 30/10/1912 | thanks him for his letter; wants to meet with him |