BRIEF [O.A.] Hertzka, Theodor Author: Hertzka, Theodor Recipient: Haeckel, Ernst Corporation: Redaction der "Pester Montagsblätter" Dating: 06.11.1871
BRIEF [O.A.] Reichenfeld, Soma Author: Reichenfeld, Soma Recipient: Haeckel, Ernst Dating: 04.06.1910
