TELEGRAMM Diemer, Jacob Author: Diemer, Jacob Recipient: Haeckel, Ernst Corporation: Komitee Konfessionslos Dating: 16.02.1914
BRIEF OHNE UMSCHLAG Lehmann, Charlotte Author: Lehmann, Charlotte Recipient: Haeckel, Ernst Corporation: Komitee Konfessionslos Dating: 07.01.1912
BRIEF OHNE UMSCHLAG Lehmann-Russbüldt, Otto Author: Lehmann-Russbüldt, Otto Recipient: Haeckel, Ernst Corporation: Komitee Konfessionslos Dating: 24.08.1914
BRIEF [O.A.] Lehmann-Russbüldt, Otto Author: Lehmann-Russbüldt, Otto Recipient: Haeckel, Ernst Corporation: Komitee Konfessionslos Dating: 10.05.1914
BRIEF OHNE UMSCHLAG Lehmann-Russbüldt, Otto Author: Lehmann-Russbüldt, Otto Recipient: Haeckel, Ernst Corporation: Komitee Konfessionslos Dating: 25.11.1913
POSTKARTE Lehmann-Russbüldt, Otto Author: Lehmann-Russbüldt, Otto Recipient: Haeckel, Ernst Corporation: Komitee Konfessionslos Dating: 06.10.1913
BRIEF OHNE UMSCHLAG Lehmann-Russbüldt, Otto Author: Lehmann-Russbüldt, Otto Recipient: Haeckel, Ernst Corporation: Komitee Konfessionslos Dating: 25.09.1913
POSTKARTE Lehmann-Russbüldt, Otto Author: Lehmann-Russbüldt, Otto Recipient: Haeckel, Ernst Corporation: Komitee Konfessionslos Dating: 13.09.1912
POSTKARTE Lehmann-Russbüldt, Otto Author: Lehmann-Russbüldt, Otto Recipient: Haeckel, Ernst Corporation: Komitee Konfessionslos Dating: 17.06.1912