ANSICHTSKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hintze [Altwein], Wilhelmine Dating: 22.04.1910
BRIEF MIT UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hintze [Altwein], Wilhelmine Dating: 10.05.1910
KARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hintze [Altwein], Wilhelmine Dating: 19.07.1910
BRIEF MIT UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hintze [Altwein], Wilhelmine Dating: 25.09.1910
PORTRÄTPOSTKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Schweninger, Ernst Dating: 15.06.1910
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Schmidt, Heinrich Dating: 22.03.1910
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Semon, Richard Dating: 20.03.1910
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Semon, Richard Dating: 01.04.1910
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Semon, Richard Dating: 03.04.1910
