POSTKARTE Rottenburg, Paul; Rottenburg, Ida Author: Rottenburg, Paul; Rottenburg, Ida Recipient: Haeckel, Agnes Dating: 24.12.1907
BRIEF [O.A.] Darwin, Charles Author: Darwin, Charles Recipient: Haeckel, Agnes Dating: 1873.02.27 - 1873.03.01
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Agnes Dating: 17.08.1879
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Agnes Dating: 06.09.1879
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Agnes Dating: 13.08.1879
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Agnes Dating: 30.08.1879