BRIEF OHNE UMSCHLAG Ludwig, Hubert Author: Ludwig, Hubert Recipient: Haeckel, Ernst Dating: 04.11.1893
BRIEF [O.A.] Strauß, Emil Author: Strauß, Emil Recipient: Haeckel, Ernst Corporation: Emil Strauss Verlagsbuchhandlung Dating: 03.02.1893
BRIEF [O.A.] Strauß, Emil Author: Strauß, Emil Recipient: Haeckel, Ernst Corporation: Emil Strauss Verlagsbuchhandlung Dating: 08.03.1893
BRIEF [O.A.] Strauß, Emil Author: Strauß, Emil Recipient: Haeckel, Ernst Corporation: Emil Strauss Verlagsbuchhandlung Dating: 04.05.1893
BRIEF [O.A.] Strauß, Emil Author: Strauß, Emil Recipient: Haeckel, Ernst Corporation: Emil Strauss Verlagsbuchhandlung Dating: 25.09.1893