Letter listing for 1780–1789
- père André Morellet, abbé Morellet to Frédéric Samuel Osterwald, 24 April 1780
- Louis XVI, king of France to Charles Gravier, comte de Vergennes, 25 April 1780
- Louis XVI, king of France to Charles III, king of Spain, 25 April 1780
- Pierre Alexandre Du Peyrou to René Louis de Girardin, marquis de Girardin, 25 April 1780
- Marie Anne de Vichy-Chamrond, marquise Du Deffand [née de Vichy] to Horace Walpole, 4th earl of Orford, 28 April 1780
- James Boswell to Doctor Samuel Johnson, 29 April 1780
- Corilla Olimpica [Maria Maddelena Morelli Fernandez] to Giovanni Cristofano Amaduzzi, 29 April 1780
- René Louis de Girardin, marquis de Girardin to Pierre Alexandre Du Peyrou, 30 April 1780
- Jeremy Bentham to William Petty, 1st marquess of Lansdowne [2nd earl of Shelburne], June–July 1780
- Jacques Henri Bernardin de Saint-Pierre to Charles Gravier, comte de Vergennes, c. May 1780
- René Louis de Girardin, marquis de Girardin to Le Journal de Paris, 1 May 1780
- René Louis de Girardin, marquis de Girardin to Jean Antoine Roucher, 1 May 1780
- James Boswell to Thomas Warton, 2 May 1780
- Société typographique de Genève to Société typographique de Neuchâtel, 2 May 1780
- Corilla Olimpica [Maria Maddelena Morelli Fernandez] to Giovanni Cristofano Amaduzzi, 2 May 1780