BRIEF [O.A.] Blossfeldt, Wilhelm Author: Blossfeldt, Wilhelm Recipient: Haeckel, Ernst Corporation: Das Monistische Jahrhundert Dating: 01.03.1913
BRIEF [O.A.] Blossfeldt, Wilhelm Author: Blossfeldt, Wilhelm Recipient: Haeckel, Ernst Corporation: Das Monistische Jahrhundert Dating: 31.12.1913
BRIEF [O.A.] Bischoff, Alfred Author: Bischoff, Alfred Recipient: Haeckel, Ernst Corporation: Alfred Bischoff, Künstlerische Photographie Dating: 01.10.1913
BRIEF [O.A.] Behm, Hans Wolfgang Author: Behm, Hans Wolfgang Recipient: Haeckel, Ernst Dating: 12.12.1913
BRIEF [O.A.] Behm, Hans Wolfgang Author: Behm, Hans Wolfgang Recipient: Haeckel, Ernst Dating: 20.12.1913
