BRIEF OHNE UMSCHLAG Benignus, Wilhelm Author: Benignus, Wilhelm Recipient: Haeckel, Ernst Dating: 31.05.1915
BRIEF OHNE UMSCHLAG Benignus, Wilhelm Author: Benignus, Wilhelm Recipient: Haeckel, Ernst Dating: 12.07.1915
BRIEF OHNE UMSCHLAG Benignus, Wilhelm Author: Benignus, Wilhelm Recipient: Haeckel, Ernst Dating: 06.04.1915
BRIEF OHNE UMSCHLAG Bernstein, Herman Author: Bernstein, Herman Recipient: Haeckel, Ernst Dating: 13.05.1916
BRIEF [O.A.] Janes, Lewis G... Author: Janes, Lewis G... Recipient: Haeckel, Ernst Corporation: The Brooklyn Ethical Association Dating: 08.04.1893
BRIEF [O.A.] Ashcroft, Edgar A... Author: Ashcroft, Edgar A... Recipient: Haeckel, Ernst Dating: 26.12.1905
BRIEF [O.A.] Ashcroft, Edgar A... Author: Ashcroft, Edgar A... Recipient: Haeckel, Ernst Dating: 30.01.1906
BRIEF [O.A.] Bain, George Grantham Author: Bain, George Grantham Recipient: Haeckel, Ernst Corporation: Newspaper Feature and Portrait Service Dating: 05.01.1909
BRIEF [O.A.] Abbott, Leonard Dalt Author: Abbott, Leonard Dalt Recipient: Haeckel, Ernst Corporation: Francisco Ferrer Association Dating: 22.06.1911