Transcript of a work entitled 'Traitté ou sont enseignées toutes les manières de piendre en mignature, avec plusiers exemples des plus excellens peintres de ce siècle', 1746, comprising an account of the different styles of various miniature painters of that era, notably Louis du Guernier, Jean Eckman, Louis van de Bruggen, Jean Petitot, as well as paintings by Sir Anthony Van Dyck, Claude Vignon and Charles Lebrun.

Research material, manuscripts, and publications of Joshua James Foster, 1880-1935, notably exhibition catalogues, 1880-1881, 1908, 1912; catalogues of miniatures owned by Sir H Stafford Northcote, [1902], and the Duke of Buccleugh (John Charles Montagu-Douglas-Scott) at the Victoria and Albert Museum, 1916-1917; proofs of articles for The Antiquary, [1884]-1889, and other publications, 1899, 1909-1918, with related letters to Foster from Viscount Cobham (Charles George Lyttelton), Earl of Gosford, (Archibald Brabazon Sparrow Acheson), Sir William Hesketh Lever, M H (Marion Harry) Spielmann, Lord Weardale (Philip James Stanhope); transcripts of published articles relating to Richard Crosse, artist, post 1910; published works annotated by Foster, 1916-1917; notes and an article on miniatures in private collections, 1912-[1916]; newspaper cuttings relating to Wessex Worthies, 1921; printed articles written by Foster, relating to miniatures and Giles Hussey, artist, 1923;
correspondence, notably relating to research projects, 1895-1917, including letter relating to the publication of British Miniature Painters, 1898, correspondence concerning the Buccleuch Miniatures, 1916, and a letter from Sir Robert Witt, 1917;
miscellaneous material collected by Foster's children, 1925-1932, notably sales catalogues featuring miniatures, 1925-1932; newspaper cuttings, 1925-1929; sales catalogue including books sold from Foster's library, 1935.