BRIEF OHNE UMSCHLAG Arrhenius, Svante Author: Arrhenius, Svante Recipient: Haeckel, Walter Dating: 23.05.1920
BRIEF OHNE UMSCHLAG Maurer, Friedrich Author: Maurer, Friedrich Recipient: Schmidt, Heinrich Dating: 01.11.1920
BRIEF OHNE UMSCHLAG Haeckel, Walter Author: Haeckel, Walter Recipient: Arrhenius, Svante Dating: 15.04.1920
BRIEF OHNE UMSCHLAG Haeckel, Walter Author: Haeckel, Walter Recipient: Heldburg, Helene von Dating: 09.12.1920
BRIEF OHNE UMSCHLAG Plate, Ludwig Author: Plate, Ludwig Recipient: Schmidt, Heinrich Dating: 01.02.1920
BRIEF OHNE UMSCHLAG Haeckel, Heinrich Author: Haeckel, Heinrich Recipient: Schmidt, Heinrich Dating: 28.10.1920