BRIEF [O.A.] Brückmann Author: Brückmann Recipient: Haeckel, Ernst Corporation: IX. Knaben-Volksschule Dating: ??.??.1905
BRIEF [O.A.] Braun, Maximilian Author: Braun, Maximilian Recipient: Haeckel, Ernst Corporation: Zoologisches Museum Dating: 02.11.1898
BRIEF [O.A.] Braun, Maximilian Author: Braun, Maximilian Recipient: Haeckel, Ernst Corporation: Koenigl. Zoologisches Museum Dating: 08.10.1910
BRIEF [O.A.] Braun, Maximilian Author: Braun, Maximilian Recipient: Haeckel, Ernst Corporation: Zoologisches Museum Dating: 18.01.1912
BRIEF [O.A.] Braun, Maximilian Author: Braun, Maximilian Recipient: Haeckel, Ernst Corporation: Zoologisches Museum Dating: 14.02.1912