BRIEF [O.A.] Schuster, Adolf Niklaus Author: Schuster, Adolf Niklaus Recipient: Haeckel, Ernst Dating: 05.12.1908
POSTKARTE Schuster, Adolf Niklaus Author: Schuster, Adolf Niklaus Recipient: Haeckel, Ernst Dating: 22.10.1908
BRIEF [O.A.] Dohle, Wilhelm Author: Dohle, Wilhelm Recipient: Haeckel, Ernst Corporation: Montreux Palace Hôtel Dating: 21.03.1908
BRIEF [O.A.] Walter-Biondetti, C... Author: Walter-Biondetti, C... Recipient: Haeckel, Ernst Dating: 08.03.1908
POSTKARTE Schuster, Adolf Niklaus Author: Schuster, Adolf Niklaus Recipient: Haeckel, Ernst Dating: 17.02.1908