BRIEF OHNE UMSCHLAG Quincke, Heinrich Author: Quincke, Heinrich Recipient: Haeckel, Ernst Dating: 14.06.1874
BRIEF OHNE UMSCHLAG Quincke, Heinrich Author: Quincke, Heinrich Recipient: Haeckel, Ernst Dating: 19.06.1874
BRIEF OHNE UMSCHLAG Dodel-Port, Arnold Author: Dodel-Port, Arnold Recipient: Haeckel, Ernst Dating: 25.11.1874
BRIEF OHNE UMSCHLAG Dodel-Port, Arnold Author: Dodel-Port, Arnold Recipient: Haeckel, Ernst Dating: 25.12.1874
BRIEF OHNE UMSCHLAG Keller, Conrad Author: Keller, Conrad Recipient: Haeckel, Ernst Dating: 15.07.1874