BRIEF OHNE UMSCHLAG Kraefft, Gustav Author: Kraefft, Gustav Recipient: Haeckel, Ernst Dating: 24.11.1894
BRIEF OHNE UMSCHLAG Blumenthal, August Author: Blumenthal, August Recipient: Haeckel, Ernst Corporation: Downing’s American Despatch General Agent for Germany and Austria August Blumenthal Hamburg Dating: 28.11.1894