BRIEF OHNE UMSCHLAG Paetel, Hermann Author: Paetel, Hermann Recipient: Haeckel, Ernst Dating: 16.10.1883
BRIEF OHNE UMSCHLAG Paetel, Hermann Author: Paetel, Hermann Recipient: Haeckel, Ernst Dating: 26.10.1883
BRIEF OHNE UMSCHLAG Paetel, Hermann Author: Paetel, Hermann Recipient: Haeckel, Ernst Dating: 29.10.1883
BRIEF OHNE UMSCHLAG Paetel, Hermann Author: Paetel, Hermann Recipient: Haeckel, Ernst Dating: 01.11.1883
BRIEF OHNE UMSCHLAG Rodenberg, Julius Author: Rodenberg, Julius Recipient: Haeckel, Ernst Corporation: Deutsche Rundschau Dating: 15.07.1883