BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Keller, Conrad Dating: 16.01.1918
BRIEF OHNE UMSCHLAG Bergdoldt, Wilhelm Author: Bergdoldt, Wilhelm Recipient: Haeckel, Ernst Dating: 13.08.1918
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Meyer, Elisabeth Dating: 16.08.1918
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Straubel, Rudolf Dating: 11.07.1918
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Straubel, Rudolf Dating: 30.06.1918
BRIEF OHNE UMSCHLAG Nitzsche, Paul Author: Nitzsche, Paul Recipient: Haeckel, Ernst Corporation: Universitätsrentamt Jena Dating: 15.01.1918
BRIEF OHNE UMSCHLAG Nitzsche, Paul Author: Nitzsche, Paul Recipient: Haeckel, Ernst Corporation: Universitätsrentamt Jena Dating: 19.04.1918
BRIEF OHNE UMSCHLAG Fischer, Paul Author: Fischer, Paul Recipient: Haeckel, Ernst Corporation: Carl Zeiss Jena Dating: 26.07.1918