BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Charlotte Dating: 09.03.1873
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hertwig, Richard Dating: 12.03.1877
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Strasburger, Eduard Dating: 25.03.1877
BRIEF OHNE UMSCHLAG Miliarakis, Spyridon Author: Miliarakis, Spyridon Recipient: Haeckel, Ernst Dating: 19.10.1914
BRIEF OHNE UMSCHLAG Rhoïdis, Emmanuel Author: Rhoïdis, Emmanuel Recipient: Haeckel, Ernst Corporation: Bibliothèque Nationale de Gréce Dating: 05.12.1889
BRIEFABSCHRIFT Haeckel, Ernst Author: Haeckel, Ernst Recipient: Henckel von Donnersmarck, Max (Graf) Dating: 12.03.1877
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Krauseneck, Heinrich Dating: 12.03.1877
