BRIEF OHNE UMSCHLAG Adler, Helene (1849 - 1923) Author: Adler, Helene (1849 - 1923) Recipient: Haeckel, Ernst Dating: 29.01.1883
BRIEF [O.A.] Hertzog, Paul Siegmund Author: Hertzog, Paul Siegmund Recipient: Haeckel, Ernst Dating: 28.12.1883