BRIEF [O.A.] Jones, Clarence Miller Author: Jones, Clarence Miller Recipient: Haeckel, Ernst Dating: 19.09.1907
BRIEF [O.A.] Hinnen, G... A... Author: Hinnen, G... A... Recipient: Haeckel, Ernst Dating: 12.12.1906
BRIEF [O.A.] Wilkening, Christian Author: Wilkening, Christian Recipient: Haeckel, Ernst Dating: 25.11.1910
BRIEF [O.A.] Wilkening, Christian Author: Wilkening, Christian Recipient: Haeckel, Ernst Corporation: Diamond Expert Dating: 01.10.1915
BRIEF [O.A.] Hoffmann, Fred L... Author: Hoffmann, Fred L... Recipient: Haeckel, Ernst Dating: 20.02.1887
BRIEF [O.A.] Rinehart, Walter H... Author: Rinehart, Walter H... Recipient: Haeckel, Ernst Dating: 04.03.1908
BRIEF [O.A.] Helder, J... Author: Helder, J... Recipient: Haeckel, Ernst Corporation: Scio College, Department of German and Philosophy Dating: 04.02.1903