BRIEF [O.A.] Schneider, Georg Heinrich Author: Schneider, Georg Heinrich Recipient: Haeckel, Ernst Dating: 10.12.1876
BRIEF [O.A.] Schneider, Georg Heinrich Author: Schneider, Georg Heinrich Recipient: Haeckel, Ernst Dating: 04.01.1877
BRIEF [O.A.] Schneider, Georg Heinrich Author: Schneider, Georg Heinrich Recipient: Haeckel, Ernst Dating: 24.01.1877
BRIEF [O.A.] Schneider, Georg Heinrich Author: Schneider, Georg Heinrich Recipient: Haeckel, Ernst Dating: 19.07.1877
BRIEF [O.A.] Walther, Johannes Author: Walther, Johannes Recipient: Haeckel, Ernst Dating: 22.05.1885
BRIEF [O.A.] Walther, Johannes Author: Walther, Johannes Recipient: Haeckel, Ernst Dating: 09.06.1885
BRIEF [O.A.] Lamarlinghi [Baronessa] Author: Lamarlinghi [Baronessa] Recipient: Haeckel, Ernst Dating: 12.10.1909
BRIEF [O.A.] Lorenzo, Giuseppe de Author: Lorenzo, Giuseppe de Recipient: Haeckel, Ernst Dating: 27.09.1893