BRIEF [O.A.] Pesendorfer, Victor Author: Pesendorfer, Victor Recipient: Haeckel, Ernst Dating: 21.10.1909
BRIEF OHNE UMSCHLAG Neupauer, Joseph Ritter von Author: Neupauer, Joseph Ritter von Recipient: Haeckel, Ernst Dating: 14.05.1909
BRIEF OHNE UMSCHLAG Neupauer, Joseph Ritter von Author: Neupauer, Joseph Ritter von Recipient: Haeckel, Ernst Dating: 24.05.1909
BRIEF [O.A.] Neupauer, Joseph Ritter von Author: Neupauer, Joseph Ritter von Recipient: Haeckel, Ernst Dating: ??.05.1909
BRIEF [O.A.] Neupauer, Joseph Ritter von Author: Neupauer, Joseph Ritter von Recipient: Haeckel, Ernst Dating: 17.07.1909
BRIEF [O.A.] Neupauer, Joseph Ritter von Author: Neupauer, Joseph Ritter von Recipient: Haeckel, Ernst Dating: 02.08.1909
BRIEF [O.A.] Neupauer, Joseph Ritter von Author: Neupauer, Joseph Ritter von Recipient: Haeckel, Ernst Dating: 05.09.1909
BRIEF OHNE UMSCHLAG Posendorfer, Victor Author: Posendorfer, Victor Recipient: Haeckel, Ernst Dating: 28.11.1909