BRIEF OHNE UMSCHLAG Bergner, Franz Author: Bergner, Franz Recipient: Haeckel, Ernst Dating: 25.04.1902
BRIEF OHNE UMSCHLAG Bergner, Franz Author: Bergner, Franz Recipient: Haeckel, Ernst Dating: 23.11.1904
BRIEF OHNE UMSCHLAG Bergner, Franz Author: Bergner, Franz Recipient: Haeckel, Ernst Dating: 12.05.1905
BRIEF OHNE UMSCHLAG Bergner, Franz Author: Bergner, Franz Recipient: Haeckel, Ernst Dating: 19.05.1907
BRIEF OHNE UMSCHLAG Bergner, Franz Author: Bergner, Franz Recipient: Haeckel, Ernst Dating: 03.03.1913
BRIEF OHNE UMSCHLAG Bergner, Franz Author: Bergner, Franz Recipient: Haeckel, Ernst Dating: 24.09.1913