BRIEF [O.A.] Kaul, C... [?] Author: Kaul, C... [?] Recipient: Haeckel, Ernst Corporation: Kaiserlich Deutsches Konsulat Dating: 09.02.1882
BRIEF [O.A.] Kaul, C... [?] Author: Kaul, C... [?] Recipient: Haeckel, Ernst Corporation: Kaiserlich Deutsches Konsulat Dating: 21.02.1882
BRIEF [O.A.] Tyrrell Leith, E... Author: Tyrrell Leith, E... Recipient: Haeckel, Ernst Dating: 12.05.1886
BRIEF [O.A.] Tyrrell Leith, E... Author: Tyrrell Leith, E... Recipient: Haeckel, Ernst Corporation: High Court Dating: 16.05.1886
BRIEF [O.A.] Tyrrell Leith, E... Author: Tyrrell Leith, E... Recipient: Haeckel, Ernst Dating: 10.09.1886
ANSICHTSKARTE Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 27.12.1913