I. Correspondence between Maxwell and Peter Guthrie Tait
(a) Tait (and William Thomson) to Maxwell, 1865-1879.
(b) Maxwell to Tait, 1859-1879.
II. Correspondence between Maxwell and writers other than Tait, 1849-1879
III. Miscellaneous letters
(a) Modern copies of correspondence dated 1849-1879.
(b) Letters regarding Maxwelliana, 1881-1951.
(c) Letters to John William Strutt, 3rd Baron Rayleigh, etc., 1880-1887.
(d) Various items before or after Maxwell's lifetime, c.1781-1897.
IV. Final drafts of books
1. Maxwell, Theory of Heat (London, 1871).
2. Maxwell, A Treatise on Electricity and Magnetism, 2 vols. (Oxford, 1873).
3. Maxwell, ed., The Electrical Researches of the Honourable Henry Cavendish (Cambridge, 1879).
4. Maxwell, Elementary Treatise on Electricity (Oxford, 1881) (posthumous - William Garnett, ed.).
V. Notes and Papers
(b) Colour and Optics
(c) Electricity and Magnetism
(e) Mechanics and Dynamics
(f) Molecular Physics and Gases
(g) Properties of matter
(h) General Physics
(j) Laboratory Administration
(m) Undergraduate Lecture Notebooks
(n) Experimental Notebooks