TELEGRAMM Stoebe, N.N. Author: Stoebe, N.N. Recipient: Haeckel, Ernst Corporation: Academischer Stammtisch Dating: 16.02.1907
TELEGRAMM N.N. Author: N.N. Recipient: Haeckel, Ernst Corporation: Med.-Naturw. Verein Jena Dating: 16.02.1904
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TELEGRAMM N.N. Author: N.N. Recipient: Haeckel, Ernst Corporation: Med.-Naturw. Verein Jena Dating: 16.02.????