BRIEF [O.A.] Constan, Estouruelle de Author: Constan, Estouruelle de Recipient: Haeckel, Ernst Dating: 20.05.1905
BRIEF [O.A.] Constan, Estouruelle de Author: Constan, Estouruelle de Recipient: Haeckel, Ernst Corporation: Conciliation Internationale Dating: 11.12.1905
BRIEF [O.A.] Dumur, Louis Author: Dumur, Louis Recipient: Haeckel, Ernst Corporation: Le Courrier Européen Dating: 21.10.1905
BRIEF [O.A.] Chauvelon, Emile Author: Chauvelon, Emile Recipient: Haeckel, Ernst Corporation: Féderation Internationale de La Libre Pensée Dating: 03.07.1905
BRIEF [O.A.] Chauvelon, Emile Author: Chauvelon, Emile Recipient: Haeckel, Ernst Corporation: Féderation Internationale de La Libre Pensée Dating: 30.08.1905
BRIEF [O.A.] Chevais, Maurice Author: Chevais, Maurice Recipient: Haeckel, Ernst Corporation: Féderation Internationale de La Pensée Dating: 17.10.1905
BRIEF [O.A.] Gsell, Paul Author: Gsell, Paul Recipient: Haeckel, Ernst Corporation: La Revue Dating: 11.09.1905