BRIEF OHNE UMSCHLAG Schuler, Fridolin Author: Schuler, Fridolin Recipient: Haeckel, Ernst Dating: 14.04.1857
BRIEF OHNE UMSCHLAG Richthofen, Ferdinand Freiherr von Author: Richthofen, Ferdinand Freiherr von Recipient: Haeckel, Ernst Dating: 04.03.1857
BRIEF OHNE UMSCHLAG Mulder, Lodewijk Author: Mulder, Lodewijk Recipient: Haeckel, Ernst Dating: 29.09.1857
BRIEF OHNE UMSCHLAG Mulder, Lodewijk Author: Mulder, Lodewijk Recipient: Haeckel, Ernst Dating: 19.05.1857
BRIEF OHNE UMSCHLAG Mulder, Lodewijk Author: Mulder, Lodewijk Recipient: Haeckel, Ernst Dating: 25.10.1857
BRIEF OHNE UMSCHLAG Merkel, August Author: Merkel, August Recipient: Haeckel, Ernst Dating: 28.12.1857
BRIEF OHNE UMSCHLAG Haeckel, Charlotte; Haeckel, Carl Gottlob Author: Haeckel, Charlotte; Haeckel, Carl Gottlob Recipient: Haeckel, Ernst Dating: 22.05.1857