BRIEF OHNE UMSCHLAG Kraigher-Porges, Josepha Author: Kraigher-Porges, Josepha Recipient: Haeckel, Ernst Dating: 05.10.1900
BRIEF OHNE UMSCHLAG Bär-Ulrich, Marie Author: Bär-Ulrich, Marie Recipient: Haeckel, Ernst Dating: 22.03.1900
BRIEF OHNE UMSCHLAG Dodel-Port, Arnold Author: Dodel-Port, Arnold Recipient: Haeckel, Ernst Dating: 03.01.1900
BRIEF OHNE UMSCHLAG Dodel-Port, Arnold Author: Dodel-Port, Arnold Recipient: Haeckel, Ernst Dating: 27.05.1900