BRIEFABSCHRIFT Wuttig Author: Wuttig Recipient: Haeckel, Ernst Corporation: Großherzoglich-Sächsisches Departement des Kultus Dating: 31.01.1919
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Linck, Gottlob Dating: 05.10.1912
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Cartellieri, Georg Maximilian Alexander Dating: 24.06.1914
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Cartellieri, Georg Maximilian Alexander Dating: 01.07.1914
BRIEFENTWURF Cartellieri, Georg Maximilian Alexander Author: Cartellieri, Georg Maximilian Alexander Recipient: Haeckel, Ernst Dating: 06.07.1914
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Cartellieri, Georg Maximilian Alexander Dating: 27.07.1914
BRIEFENTWURF Michels, Victor Karl Theodor Author: Michels, Victor Karl Theodor Recipient: Haeckel, Ernst Corporation: Senat der Universität Jena Dating: 02.12.1916
