Books: In theory (sorted by popularity)
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- The Problems of Philosophy Bertrand Russell 6822 downloads
- An Essay Concerning Humane Understanding, Volume 1 John Locke 5341 downloads
- The Critique of Pure Reason Immanuel Kant 5184 downloads
- An Enquiry Concerning Human Understanding David Hume 3285 downloads
- The Birth of Tragedy; or, Hellenism and Pessimism Friedrich Wilhelm Nietzsche 2557 downloads
- A Treatise of Human Nature David Hume 2410 downloads
- The World as Will and Idea (Vol. 1 of 3) Arthur Schopenhauer 2035 downloads
- On the quantum theory of radiation and the structure of the atom Niels Bohr 1362 downloads
- An Investigation of the Laws of Thought George Boole 1152 downloads
- Relativity : the Special and General Theory Albert Einstein 1125 downloads
- Fenimore Cooper's Literary Offences Mark Twain 1001 downloads
- Theaetetus Plato 946 downloads
- The Analysis of Mind Bertrand Russell 934 downloads
- The Theory of the Leisure Class Thorstein Veblen 906 downloads
- Kant's Prolegomena to Any Future Metaphysics Immanuel Kant 852 downloads
- Goethe's Theory of Colours Johann Wolfgang von Goethe 832 downloads
- First Course in the Theory of Equations Leonard E. Dickson 748 downloads
- The Advancement of Learning Francis Bacon 717 downloads
- "The Kingdom of God Is Within You" graf Leo Tolstoy 650 downloads
- The Theory of Moral Sentiments Adam Smith 646 downloads
- Science and hypothesis Henri Poincaré 602 downloads
- Six metaphysical meditations René Descartes 558 downloads
- The World as Will and Idea (Vol. 3 of 3) Arthur Schopenhauer 533 downloads
- Kritik der reinen Vernunft (German) Immanuel Kant 527 downloads
- Three Contributions to the Theory of Sex Sigmund Freud 491 downloads
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