BRIEF OHNE UMSCHLAG Sethe, Anna; Haeckel, Karl Author: Sethe, Anna; Haeckel, Karl Recipient: Haeckel, Ernst Dating: 21.05.1859
BRIEF OHNE UMSCHLAG Haeckel, Karl; Sethe, Wilhelmine Author: Haeckel, Karl; Sethe, Wilhelmine Recipient: Haeckel, Ernst Dating: 01.03.1859