BRIEF [O.A.] Semon, Richard W... Author: Semon, Richard W... Recipient: Haeckel, Ernst Dating: 23.12.1905
ANSICHTSKARTE Semon, Richard W... Author: Semon, Richard W... Recipient: Haeckel, Ernst Dating: 28.12.1905
BRIEF [O.A.] Semon, Richard W... Author: Semon, Richard W... Recipient: Haeckel, Ernst Dating: 12.02.1906
BRIEF [O.A.] Semon, Richard W... Author: Semon, Richard W... Recipient: Haeckel, Ernst Dating: 05.03.1906
BRIEF [O.A.] Semon, Richard W... Author: Semon, Richard W... Recipient: Haeckel, Ernst Dating: 17.06.1906
ANSICHTSKARTE Haeckel, Walther; Haeckel, Josefa Author: Haeckel, Walther; Haeckel, Josefa Recipient: Haeckel, Ernst Dating: 22.04.1909
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Luschan, Felix von; Emma von Luschan, geb. Hochstetter Dating: 16.02.1904
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Breitenbach, Wilhelm Dating: 12.02.1904