BRIEF OHNE UMSCHLAG Bleek, Theodor Author: Bleek, Theodor Recipient: Haeckel, Charlotte Dating: 16.10.1866
BRIEF OHNE UMSCHLAG Braun, Alexander Author: Braun, Alexander Recipient: Haeckel, Ernst Dating: 26.01.1866
BRIEF OHNE UMSCHLAG Braun, Alexander Author: Braun, Alexander Recipient: Haeckel, Ernst Dating: 13.10.1866
BRIEF [O.A.] Carpenter, William B. Author: Carpenter, William B. Recipient: Haeckel, Ernst Corporation: University of London Dating: 31.10.1866
BRIEF [O.A.] Focke, Gustav Waldemar Author: Focke, Gustav Waldemar Recipient: Haeckel, Ernst Dating: 16.07.1866
BRIEF [O.A.] Focke, Gustav Waldemar Author: Focke, Gustav Waldemar Recipient: Haeckel, Ernst Dating: 11.08.1866
BRIEF [O.A.] Endemann, Wilhelm Author: Endemann, Wilhelm Recipient: Haeckel, Charlotte Dating: 22.10.1866