TELEGRAMM Drugievic, Ferdinand Author: Drugievic, Ferdinand Recipient: Haeckel, Ernst Dating: 15.02.1908
TELEGRAMM Herbig, Friedrich Ludwig Author: Herbig, Friedrich Ludwig Recipient: Haeckel, Ernst Corporation: Fr. Ludw. Herbig, Buchhandlung, Inh.: J. Grunow's Erben u. K. Weisser Dating: 07.01.1908
TELEGRAMM Cosentini, Francesco Author: Cosentini, Francesco Recipient: Haeckel, Ernst Dating: 26.04.1908