BRIEF [O.A.] Schuster, Adolf Niklaus Author: Schuster, Adolf Niklaus Recipient: Haeckel, Ernst Dating: 01.09.1909
BRIEF [O.A.] Schuster, Adolf Niklaus Author: Schuster, Adolf Niklaus Recipient: Haeckel, Ernst Dating: 23.01.1909
BRIEF [O.A.] Schuster, Adolf Niklaus Author: Schuster, Adolf Niklaus Recipient: Haeckel, Ernst Dating: 14.01.1909
POSTKARTE Schuster, Adolf Niklaus Author: Schuster, Adolf Niklaus Recipient: Haeckel, Ernst Dating: 03.01.1909
BRIEF [O.A.] Knapp, Alfred Author: Knapp, Alfred Recipient: Haeckel, Ernst Corporation: Internationaler Orden für Ethik und Cultur Dating: 01.02.1909
BRIEF [O.A.] Knapp, Alfred Author: Knapp, Alfred Recipient: Haeckel, Ernst Corporation: Internationaler Orden für Ethik und Cultur Dating: 30.10.1909
BRIEF [O.A.] Knapp, Alfred Author: Knapp, Alfred Recipient: Haeckel, Ernst Corporation: Internationaler Orden für Ethik und Cultur Dating: 07.11.1909
BRIEF [O.A.] Recipient: Haeckel, Ernst Corporation: Union des Étudiants Arméniens de L`Europe Dating: 10.01.1909