The collection comprises four groups of papers:
1. Ricardo Papers. Ricardo's private papers. These include MSS of several works, the most extensive being the Notes on Malthus, which consitute over 400 pages. There are drafts of Ricardo's letters and the letters he received, including around 70 from Thomas Malthus, over 40 from James Mill, and over 30 from John Ramsey McCulloch. There is also the Journal of a Tour on the Continent, and a number of family and business letters.
2. Mill-Ricardo Papers. These consist of over 50 letters from Ricardo to James Mill and the MSS of several unpublished works by Ricardo, which were sent to Mill when he died, and include a paper on Value.
3. Letters to Thomas Malthus, circa 90 letters.
4. Letters to Ricardo's brother-in-law, J.H. Wilkinson.
The collection also includes correspondence and papers from the twentieth-century concerning the Ricardo Papers.