BRIEF OHNE UMSCHLAG Borngräber, Otto Author: Borngräber, Otto Recipient: Haeckel, Ernst Dating: 08.11.1901
BRIEF OHNE UMSCHLAG Benedikt, Moritz Author: Benedikt, Moritz Recipient: Haeckel, Ernst Dating: 15.06.1901
BRIEF OHNE UMSCHLAG Stiasny, Gustav Author: Stiasny, Gustav Recipient: Haeckel, Ernst Dating: 02.07.1901
BRIEF OHNE UMSCHLAG Carneri, Bartholomäus von Author: Carneri, Bartholomäus von Recipient: Haeckel, Ernst Dating: 20.08.1901
BRIEF [O.A.] Rullmann, Wilhelm Author: Rullmann, Wilhelm Recipient: Haeckel, Ernst Corporation: Grazer "Concordia" Dating: 03.11.1901
BRIEF [O.A.] Chandler, B... Author: Chandler, B... Recipient: Haeckel, Ernst Corporation: Thomas Cook & Son. Dating: 23.07.1901
BRIEF [O.A.] Wettstein, Richard von Author: Wettstein, Richard von Recipient: Haeckel, Ernst Corporation: K. K. Zoologisch-Botanische Gesellschaft in Wien Dating: 13.03.1901
POSTKARTE Gerold Author: Gerold Recipient: Haeckel, Ernst Corporation: Gerold & Comp. Dating: 05.06.1901