BRIEF OHNE UMSCHLAG Richthofen, Ferdinand Freiherr von Author: Richthofen, Ferdinand Freiherr von Recipient: Haeckel, Ernst Dating: 04.03.1857
BRIEF OHNE UMSCHLAG Schuler, Fridolin Author: Schuler, Fridolin Recipient: Haeckel, Ernst Dating: 14.04.1857
BRIEF OHNE UMSCHLAG Beckmann, Otto Author: Beckmann, Otto Recipient: Haeckel, Ernst Dating: 09.12.1857
BRIEF OHNE UMSCHLAG Krüger, Gustav Adolph Author: Krüger, Gustav Adolph Recipient: Haeckel, Ernst Dating: ca. 1857/1858
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Charlotte Dating: 26.06.1857
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl Gottlob; Haeckel, Charlotte Dating: 21.06.1857