BRIEF OHNE UMSCHLAG Haeckel, Charlotte Author: Haeckel, Charlotte Recipient: Haeckel, Ernst Dating: 13.07.1861
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Ried, Franz von Dating: 04.01.1861
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Ried, Franz von Dating: 30.01.1861