BRIEF [O.A.] Rosenthal, Isidor Author: Rosenthal, Isidor Recipient: Haeckel, Ernst Dating: 20.06.1875
BRIEF [O.A.] Rosenthal, Isidor Author: Rosenthal, Isidor Recipient: Haeckel, Ernst Dating: 26.11.1897
BRIEF [O.A.] Rosenthal, Isidor Author: Rosenthal, Isidor Recipient: Haeckel, Ernst Corporation: Physiologisches Institut der Universität Dating: 27.01.1898