BRIEF OHNE UMSCHLAG Schuhmacher, Josef Author: Schuhmacher, Josef Recipient: Haeckel, Ernst Dating: 12.02.1914
BRIEF [O.A.] Seelhorst, L... von Author: Seelhorst, L... von Recipient: Haeckel, Ernst Dating: 16.02.1894
BRIEF [O.A.] Wirth, Max Author: Wirth, Max Recipient: Haeckel, Ernst Corporation: Eidg. statistisches Bureau Dating: 11.08.1871
BRIEF [O.A.] Wirth, Max Author: Wirth, Max Recipient: Haeckel, Ernst Corporation: Eidg. statistisches Bureau Dating: 11.09.1871
BRIEF [O.A.] Wirth, Max Author: Wirth, Max Recipient: Haeckel, Ernst Corporation: Eidg. statistisches Bureau Dating: 27.10.1871
BRIEF OHNE UMSCHLAG Quincke, Heinrich Author: Quincke, Heinrich Recipient: Haeckel, Ernst Dating: 14.06.1874
BRIEF OHNE UMSCHLAG Quincke, Heinrich Author: Quincke, Heinrich Recipient: Haeckel, Ernst Dating: 19.06.1874