BRIEF [O.A.] Eberly, Ralph H... Author: Eberly, Ralph H... Recipient: Haeckel, Ernst Dating: 03.04.1894
BRIEF [O.A.] Godman, William D... Author: Godman, William D... Recipient: Haeckel, Ernst Dating: 28.10.1905
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 12.08.1890
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 10.12.1897
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 13.01.1898
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 01.02.1898
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 20.10.1898
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 14.01.1900
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 14.02.1900
BRIEF [O.A.] Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Corporation: Geologist and Chemist Dating: 08.06.1900