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Science
  • The Sidereal Messenger of Galileo Galilei by Galileo Galilei and Johannes Kepler
  • The Sceptical Chymist by Robert Boyle
  • Philosophiae Naturalis Principia Mathematica by Isaac Newton
  • Opticks by Isaac Newton
  • Species Plantarum, Sections I-III by Carl von Linné
  • Species Plantarum, Sections IV-V by Carl von Linné
  • Species Plantarum, Sections VI-X by Carl von Linné
  • Species Plantarum, Sections XI-XIII by Carl von Linné
  • Experiments and Observations on Different Kinds of Air by Joseph Priestley
  • Theory of the Earth by James Hutton
  • Personal Narrative of Travels to the Equinoctial Regions of America 1 Alexander Von Humboldt​
  • Personal Narrative of Travels to the Equinoctial Regions of America 2
  • Personal Narrative of Travels to the Equinoctial Regions of America 3
  • On the Origin of Species By Means of Natural Selection by Charles DarwinThe Voyage of the Beagle by Charles Darwin
  • The Descent of Man, and Selection in Relation to Sex by Charles Darwin
  • ​Narrative of the surveying voyages of His Majesty's ships Adventure and Beagle,
  • Versuche über Pflanzenhybriden by Gregor Mendel​
  • Evidence as to Man's Place in Nature by Thomas Henry Huxley
  • Criticisms on "The Origin of Species" by Thomas Henry Huxley
  • The Principles of Chemistry, Volume I by Dmitry Ivanovich Mendeleyev

Psychology
  • Galen: On the Natural Faculties by Galen
  • Galeni pergamensis de temperamentis, et de inaequali intemperie by Galen
  • Discours de la méthode by René Descartes
  • A Discourse of a Method for the Well Guiding of Reason by René Descartes
  • Selections from the Principles of Philosophy by René Descartes
  • La géométrie by René Descartes
  • Outlines of Educational Doctrine by Johann Friedrich Herbart
  • Inquiries into Human Faculty and Its Development by Francis Galton
  • The Principles of Psychology, Volume 1 (of 2) by William James
  • The Will to Believe, and Other Essays in Popular Philosophy by William James
  • The Varieties of Religious Experience: A Study in Human Nature by William James
  • Youth: Its Education, Regimen, and Hygiene by G. Stanley Hall
  • Psychology: an elementary text-book by Hermann Ebbinghaus
  • The Mind and the Brain by Alfred Binet
  • Dream Psychology: Psychoanalysis for Beginners by Sigmund Freud
  • ​Three Contributions to the Theory of Sex by Sigmund Freud
  • Collected Papers on Analytical Psychology by C. G. Jung

Economics​
  • A Treatise of Human Nature by David Hume
  • An Enquiry Concerning Human Understanding by David Hume
  • An Inquiry into the Nature and Causes of the Wealth of Nations by Adam Smith
  • On The Principles of Political Economy, and Taxation by David Ricardo
  • Principles of Political Economy by John Stuart Mill
  • Utilitarianism by John Stuart Mill
  • The Subjection of Women by John Stuart Mill
  • Political economy by William Stanley Jevons
  • Essays on Mankind and Political Arithmetic by Sir William Petty


Philosophy
  • The Analects of Confucius (from the Chinese Classics) by Confucius
  • Protagoras by PlatoApology by Plato
  • Apology, Crito, and Phaedo of Socrates by Plato
  • Sophist by Plato
  • Symposium by Plato
  • Phaedrus by Plato
  • Theaetetus by Plato
  • Parmenides by Plato
  • The Republic by Plato
  • The Ethics of Aristotle by AristotleThe Confessions of St. Augustine by Bishop of Hippo Saint Augustine
  • The City of God, Volume I by Bishop of Hippo Saint Augustine
  • The City of God, Volume II by Bishop of Hippo Saint Augustine
  • The Consolation of Philosophy by BoethiusSumma Theologica, Part I (Prima Pars) by Saint Aquinas Thomas
  • The Prince by Niccolò Machiavelli​Discourses on the First Decade of Titus Livius by Niccolò Machiavelli
  • Essays of Michel de Montaigne — Complete by Michel de MontaigneNew Atlantis by Francis BaconThe Advancement of Learning by Francis BaconNovum Organum; Or, True Suggestions for the Interpretation of Nature by Bacon
  • Leviathan by Thomas Hobbes​Discourse on the Method of Rightly Conducting One's Reason and of Seeking Truth
  • Selections from the Principles of Philosophy by René Descartes
  • ​The Thoughts of Blaise Pascal by Blaise Pascal
  • Ethics by Benedictus de Spinoza
  • Theologico-Political Treatise — Part 1 by Benedictus de Spinoza
  • Theologico-Political Treatise — Part 2 by Benedictus de Spinoza
  • Second Treatise of Government by John LockeAn Essay Concerning Humane Understanding, Volume 1 by John Locke
  • A Treatise Concerning the Principles of Human Knowledge by George Berkeley
  • Three Dialogues Between Hylas and Philonous in Opposition to Sceptics and
  • Voltaire's Philosophical Dictionary by Voltaire
  • Letters on England by VoltaireCandide by Voltaire
  • A Treatise of Human Nature by David Hume
  • An Enquiry Concerning Human Understanding by David Hume
  • Dialogues Concerning Natural Religion by David Hume
  • The Social Contract & Discourses by Jean-Jacques Rousseau
  • An Inquiry into the Nature and Causes of the Wealth of Nations by Adam Smith
  • The Critique of Pure Reason by Immanuel Kant
  • Fundamental Principles of the Metaphysic of Morals by Immanuel Kant
  • ​Hegel's Philosophy of Mind by Georg Wilhelm Friedrich Hegel
  • The World as Will and Idea (Vol. 1 of 3) by Arthur Schopenhauer
  • The World as Will and Idea (Vol. 2 of 3) by Arthur Schopenhauer
  • The World as Will and Idea (Vol. 3 of 3) by Arthur Schopenhauer
  • On Liberty by John Stuart Mill
  • Principles of Political Economy by John Stuart Mill​
  • Utilitarianism by John Stuart Mill
  • The Subjection of Women by John Stuart Mill
  • A System of Logic, Ratiocinative and Inductive by John Stuart Mill
  • The Communist Manifesto by Friedrich Engels and Karl Marx
  • The Varieties of Religious Experience: A Study in Human Nature by William James
  • Pragmatism: A New Name for Some Old Ways of Thinking by William James
  • The Principles of Psychology, Volume 1 (of 2) by William James
  • The Will to Believe, and Other Essays in Popular Philosophy by William James
  • Beyond Good and Evil by Friedrich Wilhelm Nietzsche
  • Thus Spake Zarathustra: A Book for All and None by Friedrich Wilhelm Nietzsche
  • The Birth of Tragedy; or, Hellenism and Pessimism by Friedrich Wilhelm Nietzsche
  • Creative Evolution by Henri BergsonHow We Think by John Dewey
  • Human Nature and Conduct: An introduction to social psychology by John Dewey
  • The Souls of Black Folk by W. E. B. Du Bois
  • The Negro by W. E. B. Du Bois
  • ​The Problems of Philosophy by Bertrand Russell
  • The Analysis of Mind by Bertrand Russell
  • Mysticism and Logic and Other Essays by Bertrand Russell
  • Meditaciones del Quijote by José Ortega y Gasset​
  • Tractatus Logico-Philosophicus by Ludwig Wittgenstein

Sociology
  • A General View of Positivism by Auguste Comte
  • Cours de philosophie positive. (1/6) by Auguste Comte
  • Cours de philosophie positive. (2/6) by Auguste Comte
  • Cours de philosophie positive. (3/6) by Auguste Comte
  • Cours de philosophie positive. (4/6) by Auguste Comte
  • Cours de philosophie positive. (5/6) by Auguste Comte
  • Society in America, Volume 1 (of 2) by Harriet Martineau
  • Society in America, Volume 2 (of 2) by Harriet Martineau
  • How to Observe: Morals and Manners by Harriet Martineau
  • The Communist Manifesto by Friedrich Engels and Karl Marx
  • The Elementary Forms of the Religious Life by Émile Durkheim
  • The Souls of Black Folk by W. E. B. Du Bois
  • Darkwater: Voices from Within the Veil by W. E. B. Du Bois
  • The Communist Manifesto by Friedrich Engels and Karl Marx
  • The Condition of the Working-Class in England in 1844 by Friedrich Engels
  • The Origin of the Family, Private Property and the State by Friedrich Engels
​
Politics
  • The Analects of Confucius (from the Chinese Classics) by Confucius
  • The Book of War: The Military Classic of the Far East by Sunzi and Wu
  • Crito by Plato
  • The Republic of Plato by Plato
  • The Athenian Constitution by Aristotle
  • The City of God, Volume I by Bishop of Hippo Saint Augustine
  • The City of God, Volume II by Bishop of Hippo Saint Augustine
  • The Magna Carta by Anonymous
  • Summa Theologica, Part I (Prima Pars) by Saint Aquinas Thomas
  • The Prince by Niccolò Machiavelli
  • Lettres persanes, tome I by baron de Charles de Secondat Montesquieu​
  • Lettres persanes, tome II by baron de Charles de Secondat Montesquieu
  • Esprit des lois by baron de Charles de Secondat Montesquieu
  • Franklin's Way to Wealth; or, "Poor Richard Improved" by Benjamin Franklin
  • The Social Contract & Discourses by Jean-Jacques Rousseau
  • Emile by Jean-Jacques Rousseau
  • The Confessions of Jean Jacques Rousseau
  • The Critique of Pure Reason by Immanuel Kant
  • Thoughts on the Present Discontents, and Speeches by Edmund Burke​
  • The Works of the Right Honourable Edmund Burke, Vol. 01 (of 12) by Edmund Burke
  • Common Sense by Thomas Paine
  • The Declaration of Independence of the United States of America by Thomas Jefferson
  • The Planters of Colonial Virginia by Thomas Jefferson Wertenbaker
  • The Federalist Papers by Alexander Hamilton, John Jay, and James Madison
  • A Vindication of the Rights of Woman by Mary Wollstonecraft
  • Hegel's Philosophy of Mind by Georg Wilhelm Friedrich Hegel​
  • Democracy in America — Volume 1 by Alexis de Tocqueville
  • Democracy in America — Volume 2 by Alexis de Tocqueville
  • L'ancien régime et la révolution by Alexis de Tocqueville
  • On Liberty by John Stuart Mill
  • Utilitarianism by John Stuart Mill
  • The Subjection of Women by John Stuart Mill
  • Walden, and On The Duty Of Civil Disobedience by Henry David Thoreau
  • The Communist Manifesto by Friedrich Engels and Karl Marx
  • Thus Spake Zarathustra: A Book for All and None by Friedrich Wilhelm Nietzsche
  • Beyond Good and Evil by Friedrich Wilhelm Nietzsche
  • Granos de oro: Pensamientos Seleccionados en las Obras de José Martí by José Martí
  • The Political Doctrines of Sun Yat-sen: An Exposition of the San Min Chu
  • The International Development of China by Yat-sen Sun
  • A Letter to American Workingmen, from the Socialist Soviet Republic of Russia
  • Readings on Fascism and National Socialism by Various
  • España invertebrada by José Ortega y Gasset