BRIEF OHNE UMSCHLAG Strasburger, Eduard Author: Strasburger, Eduard Recipient: Haeckel, Ernst Dating: 30.08.1871
BRIEF OHNE UMSCHLAG Strasburger, Eduard Author: Strasburger, Eduard Recipient: Haeckel, Ernst Dating: 15.09.1871
BRIEF OHNE UMSCHLAG Strasburger, Eduard Author: Strasburger, Eduard Recipient: Haeckel, Ernst Dating: 19.09.1871
BRIEF OHNE UMSCHLAG Bleek, Auguste Author: Bleek, Auguste Recipient: Haeckel, Ernst Dating: 20.12.1871
BRIEF OHNE UMSCHLAG Focke, Wilhelm Olbers Author: Focke, Wilhelm Olbers Recipient: Haeckel, Ernst Dating: 09.05.1871
BRIEF OHNE UMSCHLAG Bresgen, Maximilian Author: Bresgen, Maximilian Recipient: Haeckel, Ernst Dating: 30.04.1871
BRIEF OHNE UMSCHLAG Braun, Alexander Author: Braun, Alexander Recipient: Haeckel, Ernst Dating: 11.10.1871