TELEGRAMM Herbig, Fr... Ludw... Author: Herbig, Fr... Ludw... Recipient: Haeckel, Ernst Corporation: Fr. Ludw. Herbig, Buchhandlung, Inh.: J. Grunow's Erben u. K. Weisser Dating: 07.01.1908
TELEGRAMM Chun, Carl; Chun-Vogt, Lily Author: Chun, Carl; Chun-Vogt, Lily Recipient: Haeckel, Ernst Dating: 03.03.1907
TELEGRAMM Reinicke, Emanuel Author: Reinicke, Emanuel Recipient: Haeckel, Ernst Corporation: Wilhelm Engelmann Verlagsbuchhandlung Dating: 16.02.1904