Letter listing for 1800–1809
- Perhaps On... Insurance Charters (1806) by Sir Frederick Morton Eden, 2nd baronet, 1806
- Un témoignage by Charles Claude de Flahaut de La Billarderie, comte d’Angivillier, 1806
- père André Morellet, abbé Morellet to Joseph Alphonse Esménard, 1806
- Jacques Henri Bernardin de Saint-Pierre to [unknown], 1806
- Jacques Henri Bernardin de Saint-Pierre to Marguerite Charlotte Désirée de Saint-Pierre [née de Pelleporc], 1806–1807
- Jacques Henri Bernardin de Saint-Pierre to Hugues Bernard Maret, duc de Bassano, 1806–1807
- Jacques Henri Bernardin de Saint-Pierre to Joseph Bonaparte, 1806–1810
- Jacques Henri Bernardin de Saint-Pierre to Joseph Bonaparte, 1806–1807
- Richard Brinsley Sheridan to Hester Jane Sheridan [née Ogle], 1806
- Richard Brinsley Sheridan to Richard Peake, 1806
- Richard Brinsley Sheridan to Henry Holland, before 1806
- Richard Brinsley Sheridan to Henry Holland, before 1806
- Richard Brinsley Sheridan to Thomas Mathews, 1806 / 1807
- père André Morellet, abbé Morellet to Pierre Louis Roederer, comte Roederer, January–March 1806
- père André Morellet, abbé Morellet to Jean Baptiste Antoine Suard, 3 January 1806