BRIEF OHNE UMSCHLAG Friederici, Erna Author: Friederici, Erna Recipient: Haeckel, Ernst Dating: 14.10.1906
BRIEF OHNE UMSCHLAG Gadow, Hans Author: Gadow, Hans Recipient: Haeckel, Ernst Corporation: University Museum of Zoology Dating: 03.03.1906
BRIEF [O.A.] Fortoul, J. Gil Author: Fortoul, J. Gil Recipient: Haeckel, Ernst Corporation: Gesandtschaft von Venezuela Dating: 25.05.1906
BRIEF [O.A.] Fortoul, J. Gil Author: Fortoul, J. Gil Recipient: Haeckel, Ernst Corporation: Gesandtschaft von Venezuela Dating: 02.06.1906
TELEGRAMM N.N. Author: N.N. Recipient: Haeckel, Ernst Corporation: Bayrischer Freidenker Verband Dating: 06.08.1906
BRIEF OHNE UMSCHLAG Geheeb, Adalbert Author: Geheeb, Adalbert Recipient: Haeckel, Ernst Dating: 17.02.1906
