BRIEF OHNE UMSCHLAG Arrhenius, Svante Author: Arrhenius, Svante Recipient: Haeckel, Walter; Haeckel, Elisabeth Dating: 11.08.1919
BRIEF OHNE UMSCHLAG Arrhenius, Svante Author: Arrhenius, Svante Recipient: Haeckel, Walter Dating: 23.05.1920
BRIEF OHNE UMSCHLAG Ahlsell, Fritiof Author: Ahlsell, Fritiof Recipient: Haeckel, Ernst Dating: 23.02.1907
BRIEF OHNE UMSCHLAG Schück, Henrik Author: Schück, Henrik Recipient: Haeckel, Ernst Corporation: Upsala Universitets – Rektor Dating: 16.08.1907
BRIEF OHNE UMSCHLAG Retzius, Gustaf Author: Retzius, Gustaf Recipient: Haeckel, Ernst Dating: 19.11.1895
BRIEF OHNE UMSCHLAG Lovén, Sven Author: Lovén, Sven Recipient: Haeckel, Ernst Corporation: Zoologiska Riks-Museum Dating: 16.12.1882
BRIEF OHNE UMSCHLAG Angström, Knut; Arrhenius, Svante Author: Angström, Knut; Arrhenius, Svante Recipient: Haeckel, Ernst