BRIEF OHNE UMSCHLAG Boner, Johann H. Author: Boner, Johann H. Recipient: Haeckel, Ernst Dating: 06.10.1856
BRIEF OHNE UMSCHLAG Kölliker, Albert Author: Kölliker, Albert Recipient: Haeckel, Ernst Dating: 30.08.1856
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl Gottlob; Haeckel, Charlotte Dating: 14.09.1856
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl Gottlob; Haeckel, Charlotte Dating: 20.10.1856