BRIEF [O.A.] Fewkes, J... Walter Author: Fewkes, J... Walter Recipient: Haeckel, Ernst Dating: 06.03.1889
BRIEF [O.A.] Ginn, Edwin Author: Ginn, Edwin Recipient: Haeckel, Ernst Corporation: Ginn & Company, Publishers of School and College Text-Books Dating: 08.10.1887
BRIEF [O.A.] Arms, J... M... Author: Arms, J... M... Recipient: Haeckel, Ernst Corporation: Boston Society of Natural History Dating: 14.10.1893
BRIEF [O.A.] Kingsley, John Sterling Author: Kingsley, John Sterling Recipient: Haeckel, Ernst Corporation: The Standard Library of Natural History Dating: 01.12.1882
BRIEF OHNE UMSCHLAG Burgess, Edward Author: Burgess, Edward Recipient: Haeckel, Ernst Dating: ??.09.1885
BRIEF [O.A.] Peabody, Frederick W... Author: Peabody, Frederick W... Recipient: Haeckel, Ernst Dating: 26.04.1905
BRIEF OHNE UMSCHLAG Abbot, Samuel Leonhard Author: Abbot, Samuel Leonhard Recipient: Haeckel, Ernst Corporation: Boston Society of Natural History Dating: 04.02.1885