Question: The Social Contract is a book which Jean-Jacques Rousseau identified in which earlier book?

Context paragraphs:
Constitutional Project for Corsica: Constitutional Project for Corsica (French: "Project de constitution pour la Corse" ) is the second of Jean-Jacques Rousseau's three works on political affairs--the first being "The Social Contract", and the last being "Considerations on the Government of Poland".

Social contract: In both moral and political philosophy, the social contract or political contract is a theory or model, originating during the Age of Enlightenment, that typically addresses the questions of the origin of society and the legitimacy of the authority of the state over the individual.  Social contract arguments typically posit that individuals have consented, either explicitly or tacitly, to surrender some of their freedoms and submit to the authority of the ruler or magistrate (or to the decision of a majority), in exchange for protection of their remaining rights.  The question of the relation between natural and legal rights, therefore, is often an aspect of social contract theory.  The term takes its name from "The Social Contract" ("Du contrat social ou Principes du droit politique"), a 1762 book by Jean-Jacques Rousseau that discussed this concept.

Discourse on Inequality: Discourse on the Origin and Basis of Inequality Among Men (French: "Discours sur l'origine et les fondements de l'inégalité parmi les hommes" ), also commonly known as the "Second Discourse", is a work by philosopher Jean-Jacques Rousseau.

Dialogues: Rousseau, Judge of Jean-Jacques: Rousseau, Judge of Jean-Jacques (French: "Rousseau juge de Jean-Jacques") is a book written by Jean-Jacques Rousseau.  Rousseau's objective in writing this book was to respond to what he believed were slanderous and defamatory attacks on his reputation by his enemies.  He began writing it in 1772, and completed it in 1776.  The book is in the form of three dialogues between two characters, a "Frenchman" and "Rousseau", who argue about the merits and demerits of a third character--an author called "Jean-Jacques".  It has been described as Rousseau's most unreadable work; in the book's foreword, he concedes that the book might be repetitious and disorderly, but begs the reader's indulgence on the ground that he needs to defend his reputation from slander while he is still alive.

Idées républicaines: The pamphlet includes critical commentary on Jean-Jacques Rousseau's "The Social Contract" and Montesquieu's "The Spirit of the Laws".

Rousseau Institute: Rousseau Institute (also known as Jean-Jacques Rousseau Institute or Academy of Geneva; "French: "Académie De Genève" " or "Institut Jean-Jacques Rousseau") is a private school in Geneva, Switzerland.  In 1912, Édouard Claparède (1873–1940) created an institute to turn educational theory into a science.  This new institution was given the name of Jean-Jacques Rousseau, to whom Claparède attributed the "Copernican reversal" of putting the child, rather than the teacher, at the centre of the educational process (cf. Thomas Kuhn's notion of paradigm shift).

The Social Contract: The Social Contract, or Of the Social Contract, or Principles of Political Law (French: "Du contrat social ou Principes du droit politique" ; 1762) by Jean-Jacques Rousseau, is a book in which Rousseau theorized about the best way to establish a political community in the face of the problems of commercial society, which he had already identified in his "Discourse on Inequality" (1754).

Patrick T. Riley: Patrick Thomas Riley (October 27, 1941 – March 10, 2015) was Michael Oakeshott Professor Emeritus of Political Science at the University of Wisconsin-Madison.  He is notable for his translations of the political writings of Gottfried Leibniz and his research on social contract theory, the general will, and the history of universal jurisprudence.  His first book, "Will and Political Legitimacy", offered "a critical exposition of social contract theory in Hobbes, Locke, Rousseau, Kant, and Hegel."  In "Leibniz' Universal Jurisprudence", Riley detailed the social, moral, and political philosophy of Leibniz, arguing for the English-speaking world that Leibniz was the most important German philosopher before Kant.  He has also written extensively on the general will of Rousseau and Kant's political philosophy.  He was the editor of the "Cambridge Companion to Rousseau," and Leibniz's political writings for Cambridge University Press.

Pygmalion (Rousseau): Pygmalion (French: "Pygmalion" ) is the most influential dramatic work by Jean-Jacques Rousseau, other than his opera "Le devin du village".  Though now rarely performed, it was one of the first ever melodramas (that is, a play consisting of pantomime gestures and the spoken word, both with a musical accompaniment).  It is formed of spoken monodrama with instrumental musical interludes and thus can be credited with spreading a new theatrical genre, especially in German-speaking areas of Europe.  He wrote it in 1762, with music by Horace Coignet.  It was first performed at the Hôtel de Ville, Lyon in 1770.  The work is considered a turning point for its author, who also wrote "The Social Contract" that same year.

Confessions (Rousseau): The Confessions is an autobiographical book by Jean-Jacques Rousseau.  In modern times, it is often published with the title The Confessions of Jean-Jacques Rousseau in order to distinguish it from Saint Augustine's "Confessions".  Covering the first fifty-three years of Rousseau's life, up to 1765, it was completed in 1769, but not published until 1782, four years after Rousseau's death, even though Rousseau did read excerpts of his manuscript publicly at various salons and other meeting places.

Supporting paragraphs: The Social Contract Discourse on Inequality
Answer: Discourse on Inequality