BRIEF [O.A.] Koppelow, Traugott von Author: Koppelow, Traugott von Recipient: Haeckel, Ernst Dating: 22.11.1910
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BRIEF [O.A.] Koppelow, Traugott von Author: Koppelow, Traugott von Recipient: Haeckel, Ernst Dating: 12.12.1910
BRIEF [O.A.] Koppelow, Traugott von Author: Koppelow, Traugott von Recipient: Haeckel, Ernst Dating: 13.12.1910
BRIEF [O.A.] Koppelow, Traugott von Author: Koppelow, Traugott von Recipient: Haeckel, Ernst Dating: 16.12.1910
BRIEF [O.A.] Koppelow, Traugott von Author: Koppelow, Traugott von Recipient: Haeckel, Ernst Dating: 20.12.1910
BRIEF [O.A.] Koppelow, Traugott von Author: Koppelow, Traugott von Recipient: Haeckel, Ernst Dating: 24.12.1910