Letter listing for 1780–1789
- Gustavus III, king of Sweden to Greve Gustaf Mauritz Armfelt, 27 May 1788
- William Cowper to Harriot Hesketh, Lady Hesketh [née Cowper], 27 May 1788
- William Cowper to Spencer Cowper, 27 May 1788
- Corilla Olimpica [Maria Maddelena Morelli Fernandez] to Giovanni Cristofano Amaduzzi, 27 May 1788
- Marie Charles Henri Dubois de La Rongère to Anne Achille Alexandre Blondel, chevalier de Nouainville, 29 May 1788
- Jean Charles Clouet to Anne Achille Alexandre Blondel, chevalier de Nouainville, 30 May 1788
- Charles de Marguerye, comte de Marguerye to Anne Achille Alexandre Blondel, chevalier de Nouainville, end May–beginning June 1788
- Marie Lydie Albertine Parisis de Zevallos to Anne Achille Alexandre Blondel, chevalier de Nouainville, 31 May 1788
- James Boswell to James Beattie, 1788
- M. — Gandolfe to Jacques Henri Bernardin de Saint-Pierre, c. June 1788 [inferred existence]
- Barthélémy Augustin Blondel d’Azaincourt, seigneur de Bonneuil to Anne Achille Alexandre Blondel, chevalier de Nouainville, 1 June 1788
- Jean François de La Harpe to Count Andrei Petrovich Shuvalov, 1 June 1788
- Caroline Stéphanie Félicité de Genlis, comtesse de Genlis [née du Crest de Saint-Aubin] to Jacques Henri Bernardin de Saint-Pierre, 1 June 1788
- Jean Marie Raoul to Anne Achille Alexandre Blondel, chevalier de Nouainville, 2 June 1788
- Hester Lynch Piozzi [formerly Mrs Thrale; née Salusbury] to Sophia Byron [née Trevannion], 2 June 1788
