BRIEF [O.A.] Haeckel, Heinrich Author: Haeckel, Heinrich Recipient: Haeckel, Ernst Dating: 15.02.1902
BRIEF [O.A.] Haeckel, Heinrich Author: Haeckel, Heinrich Recipient: Haeckel, Ernst Dating: 20.12.1901
BRIEF [O.A.] Haeckel, Heinrich Author: Haeckel, Heinrich Recipient: Haeckel, Ernst Dating: 03.12.1901
BRIEF [O.A.] Haeckel, Heinrich Author: Haeckel, Heinrich Recipient: Haeckel, Ernst Dating: 27.09.1901
BRIEF [O.A.] Haeckel, Heinrich Author: Haeckel, Heinrich Recipient: Haeckel, Ernst Dating: 29.06.1901
BRIEF [O.A.] Lampert, Friedrich Ernst Wilhelm Author: Lampert, Friedrich Ernst Wilhelm Recipient: Haeckel, Ernst Dating: 19.01.1868
BRIEF [O.A.] Lampert, Friedrich Ernst Wilhelm Author: Lampert, Friedrich Ernst Wilhelm Recipient: Haeckel, Ernst Dating: 03.10.1868
