BRIEF [O.A.] ...lemann, Theodor Author: ...lemann, Theodor Recipient: Haeckel, Ernst Dating: 10.04.1905
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: de Gruyter, Walter Dating: 25.04.1905
POSTKARTE Fischer, S... Author: Fischer, S... Recipient: Haeckel, Ernst Corporation: S. Fischer, Prot. Wechselstube Dating: 19.04.1905