BRIEF OHNE UMSCHLAG Gross, Samuel D. Author: Gross, Samuel D. Recipient: Haeckel, Ernst Dating: ??.??.1876
BRIEF OHNE UMSCHLAG Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Dating: 13.03.1902
BRIEF OHNE UMSCHLAG Moore, J. Percy Author: Moore, J. Percy Recipient: Haeckel, Ernst Corporation: The Academy of Natural Sciences of Philadelphia
BRIEF OHNE UMSCHLAG Golden, Henry; Levy, Simon [et al.] Author: Golden, Henry; Levy, Simon [et al.] Recipient: Haeckel, Ernst Corporation: The Rationalist Press Association Dating: 05.02.1909
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 14.03.1905
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 26.01.1906
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 18.03.1906
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 25.04.1906
BRIEF [O.A.] Godman, William D... Author: Godman, William D... Recipient: Haeckel, Ernst Dating: 28.10.1905