Notebooks from Turnbull's time at Trinity College, Cambridge, and some other papers, including the following material:
1. Notebook of Turnbull, October Term, 1904: 'Notes on Analytical Statics as delivered by Mr Whitehead, Trinity College, Cambridge'.
2. Notebook of Turnbull: 'Astronomy - 1905 Summer. Optics - 1905 Autumn'. The lecturers are not named.
3. Notebooks of Turnbull's father, W.P. Turnbull, containing undated notes on mathematical subjects studied while at Trinity College, Cambridge. There are also notebooks of Turnbull's brother, A.P. Turnbull, who also took the Mathematical Tripos at Cambridge.
4. A notebook without name of author or date, apparently a personal workbook, with the author's commentary.
5. Notebook of Turnbull on theoretical mechanics, lectures by Mr. Whitehead.
6. Notebooks of Turnbull: 'Notes on the Theory of Functions'. A note added in pencil reads '2nd year 1905-1906'. The lecturer is not named.
Whitehead Geometry Lecture Notes: Trinity College, 1907.
Letters, the writers including E.T. Whittaker, Edinburgh (1 letter, 1914); H.S. Ruse, Edinburgh (1, 1929); and D.E. Littlewood, referring to his work on the spacetime distribution of spin tensors, (1, 1943).
Copy of M. Math. Monthly, v. 54, no. 6, containing Turnbull's 'Colin Maclaurin', pp. 318-322.
Letters from Alfred Young, mathematician, of Clare College, Cambridge, c. 1920s.
Letters from H.W. Richmond, mathematician, of King's College, Cambridge, 1941.
Letter to [G.H.] Hardy, 9 Jan. 1941, from J.H.A. Wilson, regarding Alfred Young's obituary.
Letter to B.B. Baker from Alfred Young, regarding Turnbull's paper on 'Gordan's Theorem for Double Binary Forms', 3 Mar. 1923.
Letter from Gilbert de B. Robinson, Department of Mathematics, Ottawa, 1941, regarding Alfred Young's book MSS.
Notebook of E. Drummond Turnbull, March 1919.
Paper by H.W. Turnbull, entitled 'A Synthetic Application of the symbolic invariant theory to geometry', dated 28 Oct. 1926.
Paper by H.W. Turnbull, entitled 'Lecture on Geometry' and marked 'Cam. Feb. 26, 1927'.
Box of papers marked 'Algebra'.
Box of papers marked 'Symmetric Function'.