BRIEF [O.A.] Beneden, Eduard van Author: Beneden, Eduard van Recipient: Haeckel, Ernst Dating: 26.10.1889
BRIEF [O.A.] Delstanche, Henry Author: Delstanche, Henry Recipient: Haeckel, Ernst Dating: 14.03.1907
BRIEF [O.A.] Buls Ch... Author: Buls Ch... Recipient: Haeckel, Ernst Corporation: Ligue de L'Enseignement, Conseil Général Dating: 03.04.1879
BRIEF [O.A.] Cornette, Arthur Author: Cornette, Arthur Recipient: Haeckel, Ernst Corporation: De Vrije Gedachte, La Libre Pensée Dating: 07.06.1880
BRIEF [O.A.] Buyse, Robert F... Author: Buyse, Robert F... Recipient: Haeckel, Ernst Dating: 02.03.1907
BRIEF [O.A.] Recipient: Haeckel, Ernst Corporation: Congrès international d' Anthropologie criminelle Dating: ??.??.1892
BRIEF [O.A.] Feron, Maurice Author: Feron, Maurice Recipient: Haeckel, Ernst Corporation: Congrès international des Étudiants Dating: ??.??.1884
BRIEF [O.A.] Gjurakitsch, Wladimir Author: Gjurakitsch, Wladimir Recipient: Haeckel, Ernst Dating: 15.12.1917
BRIEF OHNE UMSCHLAG Richter, Wilhelm Author: Richter, Wilhelm Recipient: Haeckel, Ernst Dating: nach 1915
