BRIEF OHNE UMSCHLAG Aegidi, Ludwig Karl Author: Aegidi, Ludwig Karl Recipient: Haeckel, Ernst Dating: 24.01.1863
BRIEF OHNE UMSCHLAG Aegidi, Ludwig Karl Author: Aegidi, Ludwig Karl Recipient: Haeckel, Ernst Dating: 16.02.1863
BRIEF OHNE UMSCHLAG Aegidi, Ludwig Karl Author: Aegidi, Ludwig Karl Recipient: Haeckel, Ernst Dating: 21.03.1863
BRIEF OHNE UMSCHLAG Schleicher, August Author: Schleicher, August Recipient: Haeckel, Ernst Dating: 09.03.1863
BRIEF OHNE UMSCHLAG Schleicher, August Author: Schleicher, August Recipient: Haeckel, Ernst Dating: 05.09.1863