BRIEF [O.A.] Graff, Ludwig von Author: Graff, Ludwig von Recipient: Haeckel, Ernst Corporation: Zool.-Zoot. Institut der K. K. Carl-Franzens-Universität Dating: 21.08.1908
POSTKARTE Pineles, Horatius M... Author: Pineles, Horatius M... Recipient: Haeckel, Ernst Dating: 02.08.1908
BRIEF [O.A.] Neupauer, Joseph Ritter von Author: Neupauer, Joseph Ritter von Recipient: Haeckel, Ernst Dating: 08.01.1908