POSTKARTE Rautenfeld, Paul von Author: Rautenfeld, Paul von Recipient: Haeckel, Ernst Dating: 03.06.1907
BRIEF OHNE UMSCHLAG Andreae, Eugen Author: Andreae, Eugen Recipient: Haeckel, Ernst Dating: 11.11.1907
ANSICHTSKARTE Kimura, T... Author: Kimura, T... Recipient: Haeckel, Ernst Corporation: Kobe College Dating: 01.01.1916