BRIEF [O.A.] Günther, Albert Author: Günther, Albert Recipient: Haeckel, Ernst Corporation: British Museum Dating: 10.08.1879
BRIEF [O.A.] Günther, Albert Author: Günther, Albert Recipient: Haeckel, Ernst Corporation: British Museum Dating: 10.11.1879
BRIEF OHNE UMSCHLAG Lankester, Edwin Ray Author: Lankester, Edwin Ray Recipient: Haeckel, Ernst Dating: 13.09.1879
BRIEF OHNE UMSCHLAG Paul, C. Kegan Author: Paul, C. Kegan Recipient: Haeckel, Ernst Dating: 25.09.1879
BRIEF OHNE UMSCHLAG Schmitz, L. Dora Author: Schmitz, L. Dora Recipient: Haeckel, Ernst Dating: 15.08.1879
BRIEF OHNE UMSCHLAG Schmitz, L. Dora Author: Schmitz, L. Dora Recipient: Haeckel, Ernst Dating: 07.12.1879