BRIEF OHNE UMSCHLAG Bleek, Theodor Author: Bleek, Theodor Recipient: Haeckel, Ernst Dating: 11.02.1876
BRIEF OHNE UMSCHLAG Bleek, Theodor Author: Bleek, Theodor Recipient: Haeckel, Ernst Dating: 24.03.1876
BRIEF OHNE UMSCHLAG Bleek, Theodor Author: Bleek, Theodor Recipient: Haeckel, Ernst Dating: 20.05.1876
BRIEF OHNE UMSCHLAG Bleek, Theodor Author: Bleek, Theodor Recipient: Haeckel, Ernst Dating: 10.08.1876