BRIEF [O.A.] Maschmeyer, Chas... Author: Maschmeyer, Chas... Recipient: Haeckel, Ernst Dating: 20.05.1893
WIDMUNG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Sarasin, Paul; Sarasin, Fritz Dating: 1893.??.?? [oder danach]
BRIEF OHNE UMSCHLAG Rohde, Matthias Author: Rohde, Matthias Recipient: Haeckel, Ernst Corporation: Matthias Rohde & Co. Hamburg. Spedition & Commission Assecuranz Dating: 07.02.1893
BRIEF OHNE UMSCHLAG Gottsche, Carl Author: Gottsche, Carl Recipient: Haeckel, Ernst Corporation: Naturhistorisches Museum Hamburg; Abtheilung für Mineralogie Dating: 22.07.1893
BRIEF OHNE UMSCHLAG Günther, Albert Author: Günther, Albert Recipient: Haeckel, Ernst Corporation: British Museum (National History) Dating: 08.08.1893
BRIEF OHNE UMSCHLAG Westien, Heinrich Author: Westien, Heinrich Recipient: Haeckel, Ernst Dating: 12.08.1893