BRIEF [O.A.] Simonyi, Ivan von Author: Simonyi, Ivan von Recipient: Haeckel, Ernst Dating: 05.02.1904
BRIEF [O.A.] Simonyi, Ivan von Author: Simonyi, Ivan von Recipient: Haeckel, Ernst Dating: 08.07.1890
BRIEF [O.A.] Simonyi, Ivan von Author: Simonyi, Ivan von Recipient: Haeckel, Ernst Dating: 23.06.1890
BRIEF [O.A.] Simonyi, Ivan von Author: Simonyi, Ivan von Recipient: Haeckel, Ernst Dating: 25.11.1899
BRIEF [O.A.] Stern, Maximilian L. Author: Stern, Maximilian L. Recipient: Haeckel, Ernst Dating: 07.03.1875