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 Mark, Edward Laurens Author: Mark, Edward Laurens Recipient: Haeckel, Ernst Corporation: Zoological Laboratory, Harvard University Dating: 25.01.1894
POSTKARTE Seward, Albert Charles Author: Seward, Albert Charles Recipient: Haeckel, Ernst Dating: 29.05.1908
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rottenburg, Paul von Dating: 23.08.1898
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rottenburg, Paul von Dating: 24.08.1898
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