BRIEF [O.A.] Jaffe, Paula Otto Author: Jaffe, Paula Otto Recipient: Haeckel, Ernst Dating: ??.02.1914
BRIEF [O.A.] Weight, Ed... Perceval Author: Weight, Ed... Perceval Recipient: Haeckel, Ernst Corporation: Trinity College Dublin Dating: 05.12.1870
BRIEF [O.A.] Weight, Ed... Perceval Author: Weight, Ed... Perceval Recipient: Haeckel, Ernst Corporation: Trinity College Dublin Dating: 20.03.1876
BRIEF [O.A.] Semon, Richard W... Author: Semon, Richard W... Recipient: Haeckel, Ernst Dating: 31.10.1891
BRIEF [O.A.] Semon, Richard W... Author: Semon, Richard W... Recipient: Haeckel, Ernst Dating: 02.06.1892
BRIEF [O.A.] Weight, Ed... Perceval Author: Weight, Ed... Perceval Recipient: Haeckel, Ernst Corporation: Trinity College Dublin Dating: 05.03.1873