POSTKARTE Baumbach, Werner von Author: Baumbach, Werner von Recipient: Haeckel, Ernst Dating: 13.09.1915
BRIEF OHNE UMSCHLAG Bockelmann, Friedrich Author: Bockelmann, Friedrich Recipient: Haeckel, Ernst Dating: 15.02.1911
ANSICHTSKARTE Bockelmann, Friedrich Author: Bockelmann, Friedrich Recipient: Haeckel, Ernst Dating: 03.03.1911
TELEGRAMM Bockelmann, Maria Francisca Author: Bockelmann, Maria Francisca Recipient: Haeckel, Ernst Dating: 07.03.1917
BRIEF OHNE UMSCHLAG Bockelmann, Friedrich Author: Bockelmann, Friedrich Recipient: Haeckel, Ernst Dating: 06.03.1907
BRIEF OHNE UMSCHLAG Bockelmann, Friedrich Author: Bockelmann, Friedrich Recipient: Haeckel, Ernst Dating: 15.02.1908
BRIEF OHNE UMSCHLAG Bockelmann, Friedrich Author: Bockelmann, Friedrich Recipient: Haeckel, Ernst Dating: 30.03.1908
BRIEF OHNE UMSCHLAG Bockelmann, Friedrich Author: Bockelmann, Friedrich Recipient: Haeckel, Ernst Dating: 20.11.1909
BRIEF OHNE UMSCHLAG Bockelmann, Friedrich Author: Bockelmann, Friedrich Recipient: Haeckel, Ernst Dating: 11.12.1909