POSTKARTE Bornträger, Heinrich Wilhelm Author: Bornträger, Heinrich Wilhelm Recipient: Haeckel, Ernst Dating: 18.10.1910
BRIEF [O.A.] Bornträger, Heinrich Wilhelm Author: Bornträger, Heinrich Wilhelm Recipient: Haeckel, Ernst Dating: 20.11.1910
POSTKARTE Bornträger, Heinrich Wilhelm Author: Bornträger, Heinrich Wilhelm Recipient: Haeckel, Ernst Dating: 15.12.1910
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