BRIEF [O.A.] Stubenrauch, Max von Author: Stubenrauch, Max von Recipient: Haeckel, Ernst Dating: 15.02.1904
BRIEF [O.A.] Seidlitz, Anna von Author: Seidlitz, Anna von Recipient: Haeckel, Ernst Corporation: Münchener Leseinstitut Dating: 05.11.1904
TELEGRAMM Semon, Richard W... Author: Semon, Richard W... Recipient: Haeckel, Ernst Dating: 16.02.1904
BRIEF [O.A.] Semon, Richard; Semon, Maria Author: Semon, Richard; Semon, Maria Recipient: Haeckel, Ernst Dating: 13.02.1904