BRIEF [O.A.] Budie-Klauke, Else Author: Budie-Klauke, Else Recipient: Haeckel, Ernst Dating: 16.02.1914
BRIEF [O.A.] Budie-Klauke, Else Author: Budie-Klauke, Else Recipient: Haeckel, Ernst Dating: 05.05.1914
BRIEF [O.A.] Juliusburger, Otto Author: Juliusburger, Otto Recipient: Haeckel, Ernst Dating: 24.01.1914
BRIEF [O.A.] Juliusburger, Otto Author: Juliusburger, Otto Recipient: Haeckel, Ernst Dating: 11.02.1914
BRIEF [O.A.] Juliusburger, Otto Author: Juliusburger, Otto Recipient: Haeckel, Ernst Dating: 27.02.1914
BRIEF [O.A.] Juliusburger, Otto Author: Juliusburger, Otto Recipient: Haeckel, Ernst Dating: 19.04.1914
BRIEF [O.A.] Juliusburger, Otto Author: Juliusburger, Otto Recipient: Haeckel, Ernst Dating: 21.06.1914