BRIEF [O.A.] Böhtlingk, Arthur Author: Böhtlingk, Arthur Recipient: Haeckel, Ernst Dating: 07.10.1891
BRIEF [O.A.] Böhtlingk, Arthur Author: Böhtlingk, Arthur Recipient: Haeckel, Ernst Dating: 20.09.1916
BRIEF [O.A.] Behm, Hans Wolfgang Author: Behm, Hans Wolfgang Recipient: Haeckel, Ernst Dating: 11.04.1909
BRIEF [O.A.] Behm, Hans Wolfgang Author: Behm, Hans Wolfgang Recipient: Haeckel, Ernst Dating: 14.04.1909
BRIEF [O.A.] Behm, Hans Wolfgang Author: Behm, Hans Wolfgang Recipient: Haeckel, Ernst Dating: 15.07.1910
BRIEF [O.A.] Behm, Hans Wolfgang Author: Behm, Hans Wolfgang Recipient: Haeckel, Ernst Dating: 28.11.1910
BRIEF [O.A.] Behm, Hans Wolfgang Author: Behm, Hans Wolfgang Recipient: Haeckel, Ernst Dating: 23.01.1911
BRIEF [O.A.] Behm, Hans Wolfgang Author: Behm, Hans Wolfgang Recipient: Haeckel, Ernst Dating: 12.12.1913
BRIEF [O.A.] Behm, Hans Wolfgang Author: Behm, Hans Wolfgang Recipient: Haeckel, Ernst Dating: 20.12.1913
