BRIEF [O.A.] Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Corporation: Senato del Regno Dating: 16.01.1911
BRIEF [O.A.] Graur, Georges St... Author: Graur, Georges St... Recipient: Haeckel, Ernst Dating: ??.??.1911
BRIEF [O.A.] Gravenhorst, Hermann Author: Gravenhorst, Hermann Recipient: Haeckel, Ernst Dating: 28.10.1911
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gravenhorst, Hermann Dating: 31.10.1911
BRIEF MIT UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hintze [Altwein], Wilhelmine Dating: 23.02.1911
KARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hintze [Altwein], Wilhelmine Dating: 11.05.1911
BRIEF MIT UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hintze [Altwein], Wilhelmine Dating: 02.06.1911
BRIEF MIT UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Hintze [Altwein], Wilhelmine Dating: 21.07.1911