There is much material relating to his geological work and to his college and university activities. [C1] consists of his diaries and journals, 1789-1816, which mostly include geological notes on the various places which he visited. [C2] contains his passports and letters of introduction, and [C3] is a collection of replies to his canvass for the Woodwardian Professorship in 1788. [C4] contains his university and college papers, including Trinity College fellowship mark sheets and Latin epistles from candidates for fellowships; there are a few papers relating to the University Press, and legal opinions relating to the foundation of Downing College. [C5] consists of his lectures and articles on geology and etymology, and [C6] his notes on geology, topography and etymology, including a description by John Wooller of a fossil found at Whitby, 1758, a list of minerals in the Duke of Grafton's collection, and several papers relating to Eearl Grosvenor's lead mine at Halkin mountain, Flintshire, as well as the printed catalogue of the sale of Hailstone's library in 1847. [C7] has miscellaneous parish and religious papers, [C8] MS and printed verse by Hailstone and others, and [C9] personal, family and miscellaneous papers. [C10] contains Hailstone's non-family correspondence, and is briefly calendared: there are runs of correspondence from Joseph Allen (Bishop of Ely), John Baynes (political writer), Thomas Cautley (clergyman), Edward D. Clarke (Professor of Mineralogy), William Gifford (editor, writer), James Hustler (clergyman), John Kaye (Bishop of Lincoln), William Lort Mansel (Master of Trinity, Bishop of Bristol), Miles Popple (clergyman), Richard Porson (Professor of Greek), 1st Baron Abinger, James Sowerby (mineralogist), Henry Warburton (radical MP), Walter Whiter (philologist), and W.H. Wollaston (mineralogist, etc.). [C11] consists of Hailstone's family correspondence, uncalendared.