BRIEF OHNE UMSCHLAG Oyama, Yohiro Author: Oyama, Yohiro Recipient: Haeckel, Ernst Corporation: Japanese Rationalist Association
POSTKARTE Rautenfeld, Paul von Author: Rautenfeld, Paul von Recipient: Haeckel, Ernst Dating: 03.06.1907
BRIEF OHNE UMSCHLAG Shigiara, Junji; Shigiara, Komaji Author: Shigiara, Junji; Shigiara, Komaji Recipient: Haeckel, Ernst Dating: 08.07.1909
KARTE Kimura, Tokuzo Author: Kimura, Tokuzo Recipient: Haeckel, Ernst Corporation: Kobe College Dating: 01.01.1914
BRIEF OHNE UMSCHLAG Andreae, Eugen Author: Andreae, Eugen Recipient: Haeckel, Ernst Dating: 11.11.1907
BRIEF OHNE UMSCHLAG Kutschera, Max Author: Kutschera, Max Recipient: Haeckel, Ernst Dating: 10.02.1900