BRIEF [O.A.] Moore, Howard J... Author: Moore, Howard J... Recipient: Haeckel, Ernst Dating: 07.03.1906
BRIEF [O.A.] Moore, Howard J... Author: Moore, Howard J... Recipient: Haeckel, Ernst Dating: 18.05.1906
BRIEF [O.A.] Müller, Hermann Author: Müller, Hermann Recipient: Haeckel, Ernst Corporation: Independent Religions Society Dating: 24.12.1906
BRIEF [O.A.] Daumann, Friedrich Author: Daumann, Friedrich Recipient: Haeckel, Ernst Dating: 09.02.1906
BRIEF [O.A.] Carus, Paul Author: Carus, Paul Recipient: Haeckel, Ernst Corporation: The Monist, The Open Court Dating: 20.06.1906
BRIEF [O.A.] Carus, Paul Author: Carus, Paul Recipient: Haeckel, Ernst Corporation: The Monist, The Open Court Dating: 08.10.1906