BRIEF OHNE UMSCHLAG Amburger, Nicolaus Alexander Author: Amburger, Nicolaus Alexander Recipient: Haeckel, Ernst Dating: 28.11.1893
FELDPOSTKARTE Bamberger, Johann Author: Bamberger, Johann Recipient: Haeckel, Ernst Dating: 14.02.1916
BRIEF OHNE UMSCHLAG Günther, Franz Author: Günther, Franz Recipient: Haeckel, Ernst Dating: 08.12.1886
BRIEF OHNE UMSCHLAG Günther, Franz Author: Günther, Franz Recipient: Haeckel, Ernst Dating: 24.12.1886
BRIEF [O.A.] Davidoff, Alexander Author: Davidoff, Alexander Recipient: Haeckel, Ernst Dating: 01.11.1897
BRIEF [O.A.] Davidoff, Alexander Author: Davidoff, Alexander Recipient: Haeckel, Ernst Dating: 08.12.1897
