BRIEF OHNE UMSCHLAG Schoeller, Cäsar Author: Schoeller, Cäsar Recipient: Haeckel, Ernst Dating: 17.05.1909
BRIEF OHNE UMSCHLAG Schoeller, Cäsar Author: Schoeller, Cäsar Recipient: Haeckel, Ernst Dating: 18.05.1910
BRIEF OHNE UMSCHLAG Schoeller, Cäsar Author: Schoeller, Cäsar Recipient: Haeckel, Ernst Dating: 16.04.1911