BRIEF OHNE UMSCHLAG Schubert, Adolph Author: Schubert, Adolph Recipient: Haeckel, Ernst Dating: 11.06.1862
BRIEF OHNE UMSCHLAG Schubert, Adolph Author: Schubert, Adolph Recipient: Haeckel, Ernst Dating: 10.08.1862
BRIEF OHNE UMSCHLAG Haeckel, Carl Gottlob Author: Haeckel, Carl Gottlob Recipient: Haeckel, Ernst; Haeckel, Anna Dating: 11.09.1862