BRIEF OHNE UMSCHLAG Hatschek, Berthold Author: Hatschek, Berthold Recipient: Haeckel, Ernst Dating: 19.05.1876
BRIEF OHNE UMSCHLAG Hatschek, Berthold Author: Hatschek, Berthold Recipient: Haeckel, Ernst Dating: 30.05.1876
BRIEF OHNE UMSCHLAG Hatschek, Berthold Author: Hatschek, Berthold Recipient: Haeckel, Ernst Dating: 26.08.1876
BRIEF OHNE UMSCHLAG Hatschek, Berthold Author: Hatschek, Berthold Recipient: Haeckel, Ernst Dating: 01.11.1876