BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Harting, Pieter Dating: 03.04.1870
BRIEF MIT UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Engelmann, Wilhelm Dating: 15.03.1870
BRIEF MIT UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Engelmann, Wilhelm Dating: 18.06.1870
BRIEF [O.A.] Haeckel, Agnes (geb. Huschke) Author: Haeckel, Agnes (geb. Huschke) Recipient: Haeckel, Ernst Dating: 06.10.1870
BRIEF [O.A.] Haeckel, Agnes (geb. Huschke) Author: Haeckel, Agnes (geb. Huschke) Recipient: Haeckel, Ernst Dating: 28.09.1870
BRIEF [O.A.] Haeckel, Agnes (geb. Huschke) Author: Haeckel, Agnes (geb. Huschke) Recipient: Haeckel, Ernst Dating: 22.09.1870
BRIEF [O.A.] Haeckel, Agnes (geb. Huschke) Author: Haeckel, Agnes (geb. Huschke) Recipient: Haeckel, Ernst Dating: 10.09.1870
BRIEF MIT UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Ratzel, Friedrich Dating: 01.02.1870