Letter listing for 1740–1749
- Voltaire [François Marie Arouet] to Georg Conrad Walther, September 1749
- Gabrielle Émilie de Châtelet-Lomont d’Haraucourt, marquise Du Châtelet-Lomont [née Le Tonnelier de Breteuil] to Claude Sallier, c. 1 September 1749
- Philip Dormer Stanhope, 4th earl of Chesterfield to Philip Stanhope, 1 September 1749
- Voltaire [François Marie Arouet] to Charles Augustin Feriol, comte d’Argental, 1 September 1749
- Lodovico Antonio Muratori to Nicola Tacoli, 2 September 1749
- Edward Young to Margaret Cavendish Bentinck, duchess of Portland [née Harley], 2 September 1749
- Lodovico Antonio Muratori to Cardinal Fortunato Tamburini, 3 September 1749
- Frederick II, king of Prussia [the Great] to Voltaire [François Marie Arouet], 4 September 1749
- Voltaire [François Marie Arouet] to René Louis de Voyer de Paulmy d’Argenson, 2nd marquis d’Argenson, 4 September 1749
- Voltaire [François Marie Arouet] to Charles Augustin Feriol, comte d’Argental, 4 September 1749
- Voltaire [François Marie Arouet] to Marie Louise Denis [née Mignot], 4 September 1749
- Voltaire [François Marie Arouet] to Charles Jean François Hénault, 4 September 1749
- Voltaire [François Marie Arouet] to Marguerite Jeanne de Staal, baronne de Staal [née Cordier de Launay], 4 September 1749
- Voltaire [François Marie Arouet] to Claude Henri de Fuzée de Voisenon, 4 September 1749
- Jeanne Antoinette Le Normant d’Etioles, marquise de Pompadour [née Poisson] to Voltaire [François Marie Arouet], c. 5 September 1749