BRIEF OHNE UMSCHLAG Giltsch, Adolf Author: Giltsch, Adolf Recipient: Haeckel, Ernst Dating: 24.04.1911
BRIEF OHNE UMSCHLAG Focke, Wilhelm Olbers Author: Focke, Wilhelm Olbers Recipient: Haeckel, Ernst Dating: 14.02.1911
KARTE Focke, Wilhelm Olbers Author: Focke, Wilhelm Olbers Recipient: Haeckel, Ernst Dating: 22.05.1911
TELEGRAMM Klinghammer, Waldemar Author: Klinghammer, Waldemar Recipient: Haeckel, Ernst Dating: 16.02.1911
POSTKARTE Klinghammer, Waldemar Author: Klinghammer, Waldemar Recipient: Haeckel, Ernst Dating: 09.03.1911
ANSICHTSKARTE Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 15.01.1911
BRIEF OHNE UMSCHLAG Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 24.01.1911
ANSICHTSKARTE Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 28.01.1911
BRIEF OHNE UMSCHLAG Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 11.02.1911
