BRIEF [O.A.] Rosenthal, Isidor Author: Rosenthal, Isidor Recipient: Haeckel, Ernst Dating: 12.10.1868
BRIEF [O.A.] Rosenthal, Isidor Author: Rosenthal, Isidor Recipient: Haeckel, Ernst Dating: 17.10.1868
BRIEF [O.A.] Rosenthal, Isidor Author: Rosenthal, Isidor Recipient: Haeckel, Ernst Dating: 11.12.1868