BRIEF [O.A.] N.N. Author: N.N. Recipient: Haeckel, Ernst Corporation: Magdeburger Feruerversicherungs-Gesellschaft, General-Agentur Dating: 14.02.1916
BRIEF OHNE UMSCHLAG Gude, Karl Author: Gude, Karl Recipient: Haeckel, Carl Gottlob Dating: 17.10.1858