BRIEF OHNE UMSCHLAG Focke, Wilhelm Olbers Author: Focke, Wilhelm Olbers Recipient: Haeckel, Ernst Dating: 15.04.1878
BRIEF OHNE UMSCHLAG Focke, Wilhelm Olbers Author: Focke, Wilhelm Olbers Recipient: Haeckel, Ernst Dating: 20.07.1878
BRIEF [O.A.] Fiedler, Bh... [?] Author: Fiedler, Bh... [?] Recipient: Haeckel, Ernst Dating: 09.04.1878
BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Dating: 01.04.1878
BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Dating: 16.07.1878
BRIEF [O.A.] Fleischer, Richard Author: Fleischer, Richard Recipient: Haeckel, Ernst Dating: 1878.04.?? [?]
BRIEF OHNE UMSCHLAG Brettauer, Josef Author: Brettauer, Josef Recipient: Haeckel, Ernst Dating: 24.05.1878
