BRIEF [O.A.] Bennett, Alexander Author: Bennett, Alexander Recipient: Haeckel, Ernst Dating: 04.02.1907
BRIEF [O.A.] Bauke Author: Bauke Recipient: Haeckel, Ernst Corporation: Dr. Bauke (Th. Zell) Dating: 01.10.1907
BRIEF [O.A.] Bechhold Author: Bechhold Recipient: Haeckel, Ernst Corporation: Die Umschau Dating: 08.04.1907
BRIEF [O.A.] Bather, Francis Arthur Author: Bather, Francis Arthur Recipient: Haeckel, Ernst Corporation: British Museum (Natural History) Dating: 30.12.1907