BRIEF OHNE UMSCHLAG Engelmann, Theodor Wilhelm Author: Engelmann, Theodor Wilhelm Recipient: Haeckel, Ernst Dating: 30.06.1888
BRIEF OHNE UMSCHLAG Engelmann, Theodor Wilhelm Author: Engelmann, Theodor Wilhelm Recipient: Haeckel, Ernst Dating: 06.07.1888
BRIEF [O.A.] Hubrecht, Ambrosius A... W... Author: Hubrecht, Ambrosius A... W... Recipient: Haeckel, Ernst Dating: 12.11.1889
BRIEF [O.A.] Hubrecht, Ambrosius A... W... Author: Hubrecht, Ambrosius A... W... Recipient: Haeckel, Ernst Corporation: Nederlandsche Dierkundige Vereeniging (Netherland Zoological Society) Dating: 25.09.1894
BRIEF [O.A.] Hubrecht, Ambrosius A... W... Author: Hubrecht, Ambrosius A... W... Recipient: Haeckel, Ernst Dating: 05.11.1896
BRIEF OHNE UMSCHLAG Engelmann, Emma Author: Engelmann, Emma Recipient: Haeckel, Ernst Dating: 28.11.1890
BRIEF OHNE UMSCHLAG Engelmann, Theodor Wilhelm Author: Engelmann, Theodor Wilhelm Recipient: Haeckel, Ernst Dating: 15.02.1891
BRIEF OHNE UMSCHLAG Engelmann, Theodor Wilhelm Author: Engelmann, Theodor Wilhelm Recipient: Haeckel, Ernst Dating: 16.02.1891
BRIEF OHNE UMSCHLAG Engelmann, Emma Author: Engelmann, Emma Recipient: Haeckel, Ernst Dating: 18.02.1891
BRIEF OHNE UMSCHLAG Engelmann, Emma Author: Engelmann, Emma Recipient: Haeckel, Ernst Dating: 16.10.1891