BRIEF OHNE UMSCHLAG Bresgen, Maximilian Author: Bresgen, Maximilian Recipient: Haeckel, Ernst Dating: 30.04.1871
BRIEF [O.A.] Bresgen, Maximilian Author: Bresgen, Maximilian Recipient: Haeckel, Ernst Dating: 29.05.1882
BRIEF [O.A.] Bresgen, Maximilian Author: Bresgen, Maximilian Recipient: Haeckel, Ernst Dating: 04.09.1887
BRIEF [O.A.] Bresgen, Maximilian Author: Bresgen, Maximilian Recipient: Haeckel, Ernst Dating: 21.09.1887
BRIEF [O.A.] Bresgen, Maximilian Author: Bresgen, Maximilian Recipient: Haeckel, Ernst Dating: 18.10.1890
BRIEF [O.A.] Bresgen, Maximilian Author: Bresgen, Maximilian Recipient: Haeckel, Ernst Dating: 02.11.1890
BRIEF [O.A.] Bresgen, Maximilian Author: Bresgen, Maximilian Recipient: Haeckel, Ernst Dating: 28.03.1892
BRIEF [O.A.] Bresgen, Maximilian Author: Bresgen, Maximilian Recipient: Haeckel, Ernst Dating: 26.01.1893
BRIEF [O.A.] Bresgen, Maximilian Author: Bresgen, Maximilian Recipient: Haeckel, Ernst Dating: 24.04.1895
BRIEF [O.A.] Bresgen, Maximilian Author: Bresgen, Maximilian Recipient: Haeckel, Ernst Dating: 15.05.1895