BRIEF OHNE UMSCHLAG Heinemann, August Author: Heinemann, August Recipient: Haeckel, Ernst Dating: 24.06.1842
BRIEF OHNE UMSCHLAG Heinemann, August Author: Heinemann, August Recipient: Haeckel, Ernst Dating: 23.07.1842
BRIEF OHNE UMSCHLAG Haeckel, Charlotte Author: Haeckel, Charlotte Recipient: Haeckel, Ernst Dating: 24.02.1842