BRIEF [O.A.] Casanova, Peregrín Author: Casanova, Peregrín Recipient: Haeckel, Ernst Dating: 04.01.1876
BRIEF [O.A.] Casanova, Peregrín Author: Casanova, Peregrín Recipient: Haeckel, Ernst Dating: 22.03.1876
BRIEF [O.A.] Casanova, Peregrín Author: Casanova, Peregrín Recipient: Haeckel, Ernst Dating: 02.01.1876