BRIEF [O.A.] Green, Jesse C... Author: Green, Jesse C... Recipient: Haeckel, Ernst Dating: 27.??.1894
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 15.09.1900
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 14.10.1901
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 24.01.1902
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 13.03.1902
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 20.04.1902
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 30.09.1902
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 13.11.1902
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 14.11.1902
POSTKARTE Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 17.11.1902