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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

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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