BRIEF [O.A.] Gaedechens, Rudolph Author: Gaedechens, Rudolph Recipient: Haeckel, Ernst Dating: 09.10.1894
BRIEF [O.A.] Gurlitt, Fritz Author: Gurlitt, Fritz Recipient: Haeckel, Ernst Corporation: Kunsthandlung und Permanente Kunstausstellung Dating: 25.08.1894
BRIEF [O.A.] Gurlitt, Fritz Author: Gurlitt, Fritz Recipient: Haeckel, Ernst Corporation: Kunsthandlung und Permanente Kunstausstellung Dating: 25.09.1894