WIA GC/1908/184 | Groothoff, Hugo and Groothoff Mrs. to Warburg, Aby 15/04/1908 | greetings |
WIA GC/1909/516 | Warburg, Aby to Schultz, Clemens 28/02/1909 | invites Schultz to give a lecture to the group of twelve married couples which makes up a private... |
WIA GC/1910/212 | Groothoff, Hugo to Warburg, Aby 13/05/1910 | thanks for a copy of Warburg's article ['Die Wandbilder']; he agrees totally with Warburg and is... |
WIA GC/1910/411 | Warburg, Aby to Marr, Heinz 22/11/1910 | supplies names of people Marr ought to invite as well; [Heinrich?] Embden is prepared to bring... |
WIA GC/1913/407 | Groothoff, Hugo [invitation to the members of the Club] 07/10/1913 | invitation to view the newly built shelter for the homeless |