Microfilms of William Petty papers, consisting of:
- Literary manuscripts
- Papers relating to Ireland, including volumes of Irish population returns, ca. 1659
- Papers relating to shipbuilding and navigation
- Letters and papers of the 6th Marquis of Lansdowne and other 19th and 20th century scholars who have used the papers for their research
- Miscellaneous deeds, mainly relating to London property
- Schedules and maps of Petty's 'Down Survey'