BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Reimer, Ernst Dating: 27.09.1892
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Schweninger, Ernst Dating: 13.07.1892
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Schweninger, Ernst Dating: 27.07.1892
BRIEF [O.A.] Griffiths, Arthur Bower Author: Griffiths, Arthur Bower Recipient: Haeckel, Ernst Dating: 24.09.1892
BRIEF [O.A.] Günther, Albert Author: Günther, Albert Recipient: Haeckel, Ernst Corporation: British Museum, Natural History Dating: 28.09.1892
BRIEF [O.A.] Günther, Albert Author: Günther, Albert Recipient: Haeckel, Ernst Corporation: British Museum, Natural History Dating: 18.10.1892
BRIEF [O.A.] Günther, Albert Author: Günther, Albert Recipient: Haeckel, Ernst Corporation: British Museum, Natural History Dating: 02.12.1892