BRIEF OHNE UMSCHLAG Kniep, Oskar Charly Author: Kniep, Oskar Charly Recipient: Haeckel, Ernst Dating: 15.02.1914
POSTKARTE Unna, P...(aul) G...(erson) Author: Unna, P...(aul) G...(erson) Recipient: Haeckel, Ernst Dating: 21.08.1914
BRIEF [O.A.] Waechter, Oscar Gustav Author: Waechter, Oscar Gustav Recipient: Haeckel, Ernst Dating: 15.02.1914
BRIEF [O.A.] Schollmayer, Willy Author: Schollmayer, Willy Recipient: Haeckel, Ernst Dating: 15.02.1914
BRIEF OHNE UMSCHLAG Sokolowsky, Alexander Author: Sokolowsky, Alexander Recipient: Haeckel, Ernst Dating: 12.02.1914
BRIEF [O.A.] Spilcker, Franz Author: Spilcker, Franz Recipient: Haeckel, Ernst Corporation: Architekturbüro Dating: 08.10.1914
BRIEF [O.A.] Fritsch, T... E... M. Author: Fritsch, T... E... M. Recipient: Haeckel, Ernst Dating: 12.02.1914