BILDPOSTKARTE te Peerdt, Ernst Author: te Peerdt, Ernst Recipient: Haeckel, Ernst Heinrich Philipp August (1834-1919) Dating: ??.03.1918
BILDPOSTKARTE Eulenberg, Herbert; Eulenberg, Hedda Author: Eulenberg, Herbert; Eulenberg, Hedda Recipient: Haeckel, Ernst Corporation: Universum Film Aktiengesellschaft Dating: 19.06.1918