'The Cubic Equation with three real roots: Its geometrical Solution and the Machine that solves it', 1956. (Delivered as lecture to the Nobel Conference in 1954.) Includes: 2 corrected MSS., specification of machine, and a German translation of the article.

Miscellaneous mathematical calculations on cubic ratios and cubic equations, n.d.

Miscellaneous mathematical calculations, n.d.

Two envelopes of drawings, diagrams, and figures for work on 'Kissing Circles'; each envelope bears Soddy's note and description dated July 1955.

Correspondence regarding publication of the translation of Soddy's article 'The Bowl of Integers' in La Nature, April 1937.

Correspondence on circles with J. Hodgkinson, 1937.

Correspondence with Therold Gosset, 1936, with note 'Sorted and arranged 20.XI.38'.

Correspondence with Therold Gosset, Jan.-Feb. 1937.

Correspondence with Harold Scott MacDonald Coreter on inter-looked spheres, with related offprints and articles, 1951-1953.