BRIEF [O.A.] Grignoux, A... Le Author: Grignoux, A... Le Recipient: Haeckel, Ernst Dating: 28.02.1910
BRIEF [O.A.] Delines, Michel Author: Delines, Michel Recipient: Haeckel, Ernst Corporation: "Temps" de la "Bibliotheque Universelle" et de "L'Odesski Listok" Dating: 28.06.1910
BRIEF [O.A.] Dumas, Georges Author: Dumas, Georges Recipient: Haeckel, Ernst Corporation: Asile Clinique, Cabinet du Médecin Dating: 27.10.1904
BRIEF [O.A.] Dumas, Georges Author: Dumas, Georges Recipient: Haeckel, Ernst Corporation: Asile Clinique, Cabinet du Médecin
BRIEF [O.A.] Dumas, Georges Author: Dumas, Georges Recipient: Haeckel, Ernst Corporation: Journal de Psychologie, Normale et Pathologique