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Browse the Entire Original Sources Database
Aristotle
Baker, Samuel White, Sir, 1821-1893
Burgess, Thornton W. (Thornton Waldo), 1874-1965
Darwin, Charles, 1809-1882
Fabre, Jean-Henri, 1823-1915
Huxley, Thomas Henry, 1825-1895
Long, William Joseph, 1867-1952
Roosevelt, Theodore, 1858-1919
Seton, Ernest Thompson, 1860-1946
Stowe, Harriet Beecher, 1811-1896
An Anatomical Disquisition
Respiration a Combustion
The Mutual Relations of Forms in Organized Beings
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