BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Eggeling, Heinrich Dating: 12.12.1890
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rambacher, Adam Dating: 08.08.1905
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rambacher, Adam Dating: 25.08.1905
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Sethe, Bertha Dating: ca. 24.01.1886
BRIEFENTWURF Haeckel, Ernst Author: Haeckel, Ernst Recipient: Göppert, Heinrich Robert Dating: 07.07.1874
BRIEFENTWURF Haeckel, Ernst Author: Haeckel, Ernst Recipient: Stremayr, Karl Ritter von Dating: 25.12.1870
BRIEFENTWURF Haeckel, Ernst Author: Haeckel, Ernst Recipient: Stremayr, Karl Ritter von Dating: ca. 25.01.1871
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Karl Dating: ??.11.1881