BRIEF [O.A.] Jankelowitz, Adolf Author: Jankelowitz, Adolf Recipient: Haeckel, Ernst Dating: 12.03.1904
BRIEF [O.A.] Jankelowitz, Adolf Author: Jankelowitz, Adolf Recipient: Haeckel, Ernst Dating: 05.11.1904
BRIEF [O.A.] Jankelowitz, Adolf Author: Jankelowitz, Adolf Recipient: Haeckel, Ernst Dating: 09.03.1907
BRIEF [O.A.] Jankelowitz, Adolf Author: Jankelowitz, Adolf Recipient: Haeckel, Ernst Dating: 16.02.1913