BRIEF [O.A.] Preyer, William Thierry Author: Preyer, William Thierry Recipient: Haeckel, Ernst Dating: 26.02.1895
BRIEF [O.A.] Preyer, William Thierry Author: Preyer, William Thierry Recipient: Haeckel, Ernst Dating: 06.10.1895
POSTKARTE Preyer, William Thierry Author: Preyer, William Thierry Recipient: Haeckel, Ernst Dating: 04.03.1895
POSTKARTE Preyer, William Thierry Author: Preyer, William Thierry Recipient: Haeckel, Ernst Dating: 27.04.1895