Ernst Haeckel

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Evolution in Modern Thought, [en]

The Evolution of Man, vol 1
A Popular Scientific Study, [en] 1912

The Evolution of Man, vol 2
A Popular Scientific Study, [en] 1912

Freedom in Science and Teaching.
from the German of Ernst Haeckel, [en] 1879

Monism as Connecting Religion and Science
A Man of Science, [en] 1892