BRIEF [O.A.] Seewald, von G... [Konsul] Author: Seewald, von G... [Konsul] Recipient: Haeckel, Ernst Dating: 31.05.1873
BRIEF [O.A.] Seewald, von G... [Konsul] Author: Seewald, von G... [Konsul] Recipient: Haeckel, Ernst Dating: 22.10.1874
BRIEF [O.A.] Seewald, von G... [Konsul] Author: Seewald, von G... [Konsul] Recipient: Haeckel, Ernst Dating: 08.11.1874
BRIEF [O.A.] Seewald, von G... [Konsul] Author: Seewald, von G... [Konsul] Recipient: Haeckel, Ernst Dating: 15.02.1875