BRIEF [O.A.] Wettstein, Hermann Author: Wettstein, Hermann Recipient: Haeckel, Ernst Corporation: The Teleo Mechanics of Nature Dating: 09.06.1908
BRIEF [O.A.] Wettstein, Hermann Author: Wettstein, Hermann Recipient: Haeckel, Ernst Corporation: The Teleo Mechanics of Nature Dating: 07.06.1908
BRIEF [O.A.] Wood, Geo... B... Author: Wood, Geo... B... Recipient: Haeckel, Ernst Dating: 02.12.1909