BRIEF OHNE UMSCHLAG Moore, J. Percy Author: Moore, J. Percy Recipient: Haeckel, Ernst Corporation: The Academy of Natural Sciences of Philadelphia Dating: 25.05.1911
BRIEF OHNE UMSCHLAG Frazer, Persifor Author: Frazer, Persifor Recipient: Haeckel, Ernst Dating: 02.05.1902
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