BRIEF [O.A.] Fewkes, J... Walter Author: Fewkes, J... Walter Recipient: Haeckel, Ernst Dating: 22.01.1888
BRIEF [O.A.] Dewees, N... M... Author: Dewees, N... M... Recipient: Haeckel, Ernst Dating: 03.07.1907
BRIEF [O.A.] Dewees, N... M... Author: Dewees, N... M... Recipient: Haeckel, Ernst Dating: 19.07.1909
BRIEF OHNE UMSCHLAG Darwin, Francis Author: Darwin, Francis Recipient: Haeckel, Ernst Dating: 03.03.1909
BRIEF OHNE UMSCHLAG Darwin, Francis Author: Darwin, Francis Recipient: Haeckel, Ernst Dating: 02.05.1909
BRIEF OHNE UMSCHLAG Gadow, Hans Author: Gadow, Hans Recipient: Haeckel, Ernst Corporation: University Museum of Zoology Dating: 03.03.1906
BRIEF OHNE UMSCHLAG Gadow, Hans Author: Gadow, Hans Recipient: Haeckel, Ernst Corporation: University Museum of Zoology Dating: 17.01.1909
BRIEF OHNE UMSCHLAG Gadow, Hans Author: Gadow, Hans Recipient: Haeckel, Ernst Corporation: University Museum of Zoology Dating: 06.03.1909