TELEGRAMM Semon, Richard W... Author: Semon, Richard W... Recipient: Haeckel, Ernst Dating: 16.02.1904
BRIEF [O.A.] Semon, Richard W... Author: Semon, Richard W... Recipient: Haeckel, Ernst Dating: 17.10.1904
BRIEF [O.A.] Semon, Richard W... Author: Semon, Richard W... Recipient: Haeckel, Ernst Dating: 29.12.1904