BRIEF [O.A.] Wedekind Author: Wedekind Recipient: Haeckel, Ernst Corporation: Badische Geographische Gesellschaft Dating: 01.10.1882
BRIEF [O.A.] Poritzky, J... E... Author: Poritzky, J... E... Recipient: Haeckel, Ernst Corporation: Der Dramaturg des Großh. Hoftheaters Dating: 10.07.1916
BRIEF [O.A.] Helbing, Paul A... Author: Helbing, Paul A... Recipient: Haeckel, Ernst Dating: 15.02.1904
BRIEF [O.A.] Nüßlin, Otto Author: Nüßlin, Otto Recipient: Haeckel, Ernst Corporation: Zoologische Abtheilung des Großherzogl. Badischen Naturalienkabinets Dating: 26.07.1903
BRIEF [O.A.] Nüßlin, Otto Author: Nüßlin, Otto Recipient: Haeckel, Ernst Corporation: Zool. Institut der TH Dating: 15.02.1904
BRIEF [O.A.] Nüßlin, Otto Author: Nüßlin, Otto Recipient: Haeckel, Ernst Corporation: Zool. Institut der TH Dating: 31.12.1905
BRIEF [O.A.] Nüßlin, Otto Author: Nüßlin, Otto Recipient: Haeckel, Ernst Corporation: Zool. Institut der TH Dating: 18.01.1906