BRIEF OHNE UMSCHLAG Bornmüller, Josef Author: Bornmüller, Josef Recipient: Haeckel, Ernst Dating: 11.06.1912
BRIEF OHNE UMSCHLAG Bornmüller, Josef Author: Bornmüller, Josef Recipient: Haeckel, Ernst Dating: 20.06.1912
BRIEF OHNE UMSCHLAG Bornmüller, Josef Author: Bornmüller, Josef Recipient: Haeckel, Ernst Corporation: Herbarium Haußknecht Dating: 14.08.1912
BRIEF [O.A.] Bojanowski, Paul von Author: Bojanowski, Paul von Recipient: Haeckel, Ernst Corporation: Grossherzogliche Bibliothek Dating: 13.05.1903
BRIEF [O.A.] Bojanowski, Paul von Author: Bojanowski, Paul von Recipient: Haeckel, Ernst Dating: 25.05.1903
BRIEF OHNE UMSCHLAG Bermbach, Josef Author: Bermbach, Josef Recipient: Haeckel, Ernst Corporation: Verein "Kriegsmuseum Weimar" Dating: 10.12.1914