BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Karl Dating: 21.10.1895
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Breitenbach, Wilhelm Dating: 11.10.1895
BRIEF OHNE UMSCHLAG Staël von Holstein, Reinhold Baron Author: Staël von Holstein, Reinhold Baron Recipient: Haeckel, Ernst Dating: 29.04.1895
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Beyrich, Clementine, geb. Helm Dating: 15.10.1895
BRIEF OHNE UMSCHLAG Staël von Holstein, August Baron Author: Staël von Holstein, August Baron Recipient: Haeckel, Ernst Dating: 19.04.1895