BRIEF OHNE UMSCHLAG Bäumler, Johann Andreas Author: Bäumler, Johann Andreas Recipient: Krause, Ernst Dating: 10.10.1877
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Krause, Ernst Dating: 18.02.1883
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Krause, Ernst Dating: 15.11.1893
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Krause, Ernst Dating: 14.01.1886