BRIEF [O.A.] Herzberg, Hans Author: Herzberg, Hans Recipient: Haeckel, Ernst Corporation: Techno-Photographisches Archiv Dating: 31.01.1919
BRIEF [O.A.] Huldschinsky, Carl Author: Huldschinsky, Carl Recipient: Haeckel, Ernst Dating: 15.02.1914
BRIEF [O.A.] Huldschinsky, Carl Author: Huldschinsky, Carl Recipient: Haeckel, Ernst Dating: 11.05.1919
BRIEF [O.A.] Huldschinsky, Carl Author: Huldschinsky, Carl Recipient: Haeckel, Ernst Dating: 13.05.1919
BRIEF [O.A.] Huldschinsky, Carl Author: Huldschinsky, Carl Recipient: Haeckel, Ernst Dating: 30.05.1919
BRIEF [O.A.] Huldschinsky, Carl Author: Huldschinsky, Carl Recipient: Haeckel, Ernst Dating: 05.06.1919
