BRIEF [O.A.] Martens, Eduard von Author: Martens, Eduard von Recipient: Haeckel, Ernst Dating: 20.05.1865
BRIEF [O.A.] Martens, Eduard von Author: Martens, Eduard von Recipient: Haeckel, Ernst Dating: 22.07.1865
BRIEF [O.A.] Martens, Eduard von Author: Martens, Eduard von Recipient: Haeckel, Ernst Dating: 28.11.1865
BRIEF [O.A.] Nathusing, Herm... Author: Nathusing, Herm... Recipient: Haeckel, Ernst Dating: 24.04.1865
BRIEF [O.A.] Seewald, von G... [Konsul] Author: Seewald, von G... [Konsul] Recipient: Haeckel, Ernst Dating: 08.03.1865
BRIEF [O.A.] Hildebrand, Bruno Author: Hildebrand, Bruno Recipient: Haeckel, Ernst Dating: 13.04.1865