BRIEF [O.A.] Galiment, Henri Author: Galiment, Henri Recipient: Haeckel, Ernst Corporation: Ministère de l' Instruction Publique, Musée Guimet Dating: 14.12.1894
BRIEF OHNE UMSCHLAG Ritter, Paul von Author: Ritter, Paul von Recipient: Haeckel, Ernst Dating: 29.03.1894
BRIEF OHNE UMSCHLAG Ritter, Paul von Author: Ritter, Paul von Recipient: Haeckel, Ernst Dating: 25.03.1894
BRIEF OHNE UMSCHLAG Ritter, Paul von Author: Ritter, Paul von Recipient: Haeckel, Ernst Dating: 24.03.1894