BRIEF [O.A.] Grünspan, Therese Author: Grünspan, Therese Recipient: Haeckel, Ernst Dating: ??.02.1906
BRIEF [O.A.] Schensky, W... Author: Schensky, W... Recipient: Haeckel, Ernst Corporation: Gesellschaft Odessaer Ärzte Dating: 20.07.1913