BRIEF [O.A.] Budie-Klauke, Else Author: Budie-Klauke, Else Recipient: Haeckel, Ernst Dating: 04.03.1917
BRIEF [O.A.] Budie-Klauke, Else Author: Budie-Klauke, Else Recipient: Haeckel, Ernst Dating: 01.04.1917
BRIEF [O.A.] Budie-Klauke, Else Author: Budie-Klauke, Else Recipient: Haeckel, Ernst Dating: 15.02.1917