BRIEF [O.A.] Littrow, Heinrich von Author: Littrow, Heinrich von Recipient: Haeckel, Ernst Dating: 05.01.1881
BRIEF [O.A.] Littrow, Heinrich von Author: Littrow, Heinrich von Recipient: Haeckel, Ernst Dating: 29.06.1881
BRIEF OHNE UMSCHLAG Marojevic, Bonagracija Author: Marojevic, Bonagracija Recipient: Haeckel, Ernst Dating: 19.01.1881