BRIEF [O.A.] Kilian, Waldemar C... Author: Kilian, Waldemar C... Recipient: Haeckel, Ernst Dating: 22.02.1916
BRIEF [O.A.] Kilian, Waldemar C... Author: Kilian, Waldemar C... Recipient: Haeckel, Ernst Dating: 06.02.1917
BRIEF [O.A.] Kilian, Waldemar C... Author: Kilian, Waldemar C... Recipient: Haeckel, Ernst Dating: 31.05.????
BRIEF [O.A.] Kilian, Waldemar C... Author: Kilian, Waldemar C... Recipient: Haeckel, Ernst Dating: 15.02.1914