Letter listing for 1770–1779
- Voltaire [François Marie Arouet] to Paul Claude Moultou, 1 January 1770
- Voltaire [François Marie Arouet] to Gabriel Cramer, c. 1 January 1770
- François Julien Desroches du Dresnay, chevalier Desroches to Pierre Poivre, 2 January 1770
- Jean Jacques Rousseau to Julie Anne Marie Boy de La Tour [née Roguin], 2 January 1770
- Voltaire [François Marie Arouet] to Catherine II, czarina of Russia [the Great], 2 January 1770
- Continuation of the Journal of a tour of the Lakes and Yorkshire [5–8 October 1769] by Thomas Gray for Doctor Thomas Wharton, 3 January 1770
- Thomas Gray to Doctor Thomas Wharton, 3 January 1770
- Doctor Richard Price to Jasper Mauduit, 3 January 1770
- Voltaire [François Marie Arouet] to Jean François de Saint-Lambert, marquis de Saint-Lambert, 3 January 1770
- Frederick II, king of Prussia [the Great] to Voltaire [François Marie Arouet], 4 January 1770
- Adam Ferguson to Sir William Pulteney, 5th Baronet Johnstone [née Johnstone], 4 January 1770
- Charles Henry Chrétien Rosé to Voltaire [François Marie Arouet], 4 January 1770
- Treasury Journal extract by Lords Commissioners of the Treasury [Treasury Board], 4 January 1770
- Description of lands by Thomas Walpole, Benjamin Franklin, John Sargent and Samuel Wharton for His/Her Majesty’s most honourable Privy Council, c. 4 January 1770
- Jacques Henri Bernardin de Saint-Pierre to Pierre Michel Hennin, 5 January 1770