BRIEF OHNE UMSCHLAG Grazie, Marie Eugenie delle Author: Grazie, Marie Eugenie delle Recipient: Haeckel, Ernst Dating: 27.06.1906
BRIEF OHNE UMSCHLAG Jelinek, Leopold Author: Jelinek, Leopold Recipient: Haeckel, Ernst Dating: 01.10.1906
BRIEF OHNE UMSCHLAG Benedict, Johann Author: Benedict, Johann Recipient: Haeckel, Ernst Dating: 27.01.1906
BRIEF OHNE UMSCHLAG Jelinek, Leopold Author: Jelinek, Leopold Recipient: Hackel, Ernst Dating: ??.09.1906