Letter listing for 1730–1739
- Francesco Brembati, conte Brembati to Lodovico Antonio Muratori, 2 October 1739
- père Charles Irénée Castel, abbé de Saint-Pierre to Voltaire [François Marie Arouet], 2 October 1739
- Voltaire [François Marie Arouet] to Claude Adrien Helvétius, 3 October 1739
- Voltaire [François Marie Arouet] to Claude Adrien Helvétius, 3 October 1739
- Françoise Paule Huguet de Graffigny [née d’Issembourg Du Buisson d’Happoncourt] to François Antoine Devaux, c. 5 October 1739
- Richard West [junior] to Thomas Gray and Horace Walpole, 4th earl of Orford, 5 October 1739
- Pauline Félicité de Vintimille, marquise de Vintimille [née de Mailly-Nesle] to Marie Anne de Vichy-Chamrond, marquise Du Deffand [née de Vichy], 7 October 1739
- Voltaire [François Marie Arouet] to Jean François Du Bellay Du Resnel, 7 October 1739
- Françoise Paule Huguet de Graffigny [née d’Issembourg Du Buisson d’Happoncourt] to François Antoine Devaux, c. 8 October 1739
- Richard West [junior] to Thomas Gray, 9 October 1739
- Frederick II, king of Prussia [the Great] and Dietrich von Keyserlingk, graf von Keyserlingk to Voltaire [François Marie Arouet], 10 October 1739
- John Boyle, 5th earl of Cork and Orrery to Jonathan Swift, 10 October 1739
- Voltaire [François Marie Arouet] to Martin Folkes, 10 October 1739
- Voltaire [François Marie Arouet] to Robert Smith, 10 October 1739
- Françoise Paule Huguet de Graffigny [née d’Issembourg Du Buisson d’Happoncourt] to François Antoine Devaux, c. 11 October 1739