BRIEF [O.A.] ...lemann, Theodor Author: ...lemann, Theodor Recipient: Haeckel, Ernst Dating: 10.04.1905
BRIEF [O.A.] Ziegler, Heinrich Ernst Author: Ziegler, Heinrich Ernst Recipient: Haeckel, Ernst Dating: 24.11.1900
BRIEFABSCHRIFT Wuttig Author: Wuttig Recipient: Haeckel, Ernst Corporation: Großherzoglich-Sächsisches Departement des Kultus Dating: 31.01.1919
BRIEFENTWURF Cartellieri, Georg Maximilian Alexander Author: Cartellieri, Georg Maximilian Alexander Recipient: Haeckel, Ernst Dating: 06.07.1914
BRIEFENTWURF Michels, Victor Karl Theodor Author: Michels, Victor Karl Theodor Recipient: Haeckel, Ernst Corporation: Senat der Universität Jena Dating: 02.12.1916
BRIEFENTWURF Hedemann, Justus Wilhelm Author: Hedemann, Justus Wilhelm Recipient: Haeckel, Ernst Dating: 06.06.1919
ABSCHRIFT Paulssen, Arnold Author: Paulssen, Arnold Recipient: Haeckel, Ernst Corporation: Kultusministerium des Freistaates Sachsen Weimar Eisenach Dating: 11.07.1919