BRIEF [O.A.] Kollmann, Julius Author: Kollmann, Julius Recipient: Haeckel, Ernst Corporation: Anthropologische Gesellschaft Dating: 28.03.1875
BRIEF [O.A.] Stern, Maximilian L. Author: Stern, Maximilian L. Recipient: Haeckel, Ernst Dating: 03.05.1875
BRIEF OHNE UMSCHLAG Haeckel, Charlotte Author: Haeckel, Charlotte Recipient: Haeckel, Agnes Dating: 13.09.1875
BRIEF OHNE UMSCHLAG Haeckel, Charlotte Author: Haeckel, Charlotte Recipient: Haeckel, Ernst Dating: 14.02.1875
BRIEF OHNE UMSCHLAG Haeckel, Charlotte Author: Haeckel, Charlotte Recipient: Haeckel, Ernst Dating: 15.02.1875