ROUSSEAU (Jean-Jacques). Of the Social Contract, or Principles of Political Law. Amsterdam, Marc-Michel Rey, 1763. [followed by] Jean-Jacques Rousseau, citizen of Geneva, to Christophe de Beaumont. Amsterdam, Marc-Michel Rey, 1763. [followed by] Jean-Jacques Rousseau, citizen of Geneva, to Jean-François de Montillet. In-12, edition containing his letter to the council of Geneva. Enriched with a handwritten copy of Rousseau's letter to the council of Geneva at the end of the volume. Bound in full contemporary marbled basane, spine decorated with 5 bands. (the title page of the last letter is missing)