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BRIEF [O.A.] Sprenger, Therese Author: Sprenger, Therese Recipient: Haeckel, Ernst Dating: 14.11.1912
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BRIEF [O.A.] Sprenger, Gustav; Sprenger, Therese Author: Sprenger, Gustav; Sprenger, Therese Recipient: Haeckel, Ernst Dating: 15.02.1911
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