BRIEF OHNE UMSCHLAG Dodel-Port, Arnold Author: Dodel-Port, Arnold Recipient: Haeckel, Ernst Dating: 07.11.1901
BRIEF OHNE UMSCHLAG Keller, Conrad Author: Keller, Conrad Recipient: Haeckel, Ernst Dating: 12.07.1901
BRIEF OHNE UMSCHLAG Krause, Adelheid Author: Krause, Adelheid Recipient: Haeckel, Ernst Dating: 24.08.1901
BRIEF OHNE UMSCHLAG Sigg-Wagner, Hermann Author: Sigg-Wagner, Hermann Recipient: Haeckel, Ernst Dating: 04.01.1901
BRIEF OHNE UMSCHLAG Kraigher-Porges, Josepha Author: Kraigher-Porges, Josepha Recipient: Haeckel, Ernst Dating: 18.12.1901