BRIEF OHNE UMSCHLAG Pullar, F. Adelgunde Author: Pullar, F. Adelgunde Recipient: Haeckel, Ernst Dating: 12.07.1887
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Charlotte [Mutter] Dating: 30.08.1879
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Agnes Dating: 30.08.1879