BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rautenfeld, Paul von Dating: 13.03.1914
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BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rautenfeld, Paul von Dating: 15.08.1904
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rautenfeld, Paul von Dating: 27.04.1906
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rautenfeld, Paul von Dating: 21.12.1906
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rautenfeld, Paul von Dating: 30.09.1907
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rautenfeld, Paul von Dating: 19.11.1907
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rautenfeld, Paul von Dating: 06.10.1909
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rautenfeld, Paul von Dating: 29.03.1911