BRIEF [O.A.] Ziegler, Heinrich Ernst Author: Ziegler, Heinrich Ernst Recipient: Haeckel, Ernst Dating: 24.11.1900
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
BRIEF [O.A.] Dorovius, E... Author: Dorovius, E... Recipient: Haeckel, Ernst Corporation: Verein für Feuerbestattungen Jena Dating: 04.02.1913
BRIEF [O.A.] Dorovius, E... Author: Dorovius, E... Recipient: Haeckel, Ernst Corporation: Verein für Feuerbestattungen Jena Dating: 11.07.1914