BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Benedikt, Moriz Dating: 04.04.1918
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Heinrich Dating: 23.11.1918
BILDPOSTKARTE Grimsehl, Carl; Krall, Karl Author: Grimsehl, Carl; Krall, Karl Recipient: Haeckel, Ernst Dating: 19.08.1918
BRIEF OHNE UMSCHLAG Daelen, Eduard Adolf Author: Daelen, Eduard Adolf Recipient: Haeckel, Ernst Dating: 22.08.1918
