BRIEF OHNE UMSCHLAG Engelmann, Theodor Wilhelm Author: Engelmann, Theodor Wilhelm Recipient: Haeckel, Ernst Dating: 24.03.1894
BRIEF OHNE UMSCHLAG Greshoff, Maurits Author: Greshoff, Maurits Recipient: Haeckel, Ernst Corporation: Koloniaal Museum Haarlem Dating: 25.11.1901
BRIEF OHNE UMSCHLAG Moltzer, Christiaan Author: Moltzer, Christiaan Recipient: Haeckel, Ernst Corporation: Amsterdamsche Likeurstokerij 'T Lootsje' - Erven Lucas Bols Dating: 13.12.1907
BRIEF OHNE UMSCHLAG Fürbringer, Max Author: Fürbringer, Max Recipient: Haeckel, Ernst Dating: 04.06.1882
BRIEF OHNE UMSCHLAG Fürbringer, Max Author: Fürbringer, Max Recipient: Haeckel, Ernst Dating: 05.01.1888
BRIEF OHNE UMSCHLAG Fürbringer, Max Author: Fürbringer, Max Recipient: Haeckel, Ernst Dating: 09.03.1888
BRIEF OHNE UMSCHLAG Fürbringer, Max Author: Fürbringer, Max Recipient: Haeckel, Ernst Dating: 19.06.1888
BRIEF OHNE UMSCHLAG Delprat, Theodore Author: Delprat, Theodore Recipient: Haeckel, Ernst Dating: 24.09.1902
BRIEF OHNE UMSCHLAG Delprat, Theodore Author: Delprat, Theodore Recipient: Haeckel, Ernst Dating: 16.08.1904