BRIEF [O.A.] Bartels, Edmund von Author: Bartels, Edmund von Recipient: Haeckel, Ernst Dating: 11.05.1861
BRIEF [O.A.] Bartels, Edmund von Author: Bartels, Edmund von Recipient: Haeckel, Ernst Dating: 20.07.1861
BRIEF [O.A.] Bartels, Edmund von Author: Bartels, Edmund von Recipient: Haeckel, Ernst Dating: 06.09.1861
BRIEF OHNE UMSCHLAG Gegenbaur, Carl Author: Gegenbaur, Carl Recipient: Haeckel, Ernst Dating: 16.03.1861
BRIEF OHNE UMSCHLAG Gegenbaur, Carl Author: Gegenbaur, Carl Recipient: Haeckel, Ernst Dating: 16.02.1861
BRIEF OHNE UMSCHLAG Gegenbaur, Carl Author: Gegenbaur, Carl Recipient: Haeckel, Ernst Dating: 24.10.1861
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl & Charlotte [Eltern] Dating: 29.06.1861
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl & Charlotte [Eltern] Dating: 24.04.1861
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl & Charlotte [Eltern] Dating: 29.04.1861