See A Guide to Manuscripts and Documents in the British Isles relating to Africa, compiled by N Matthews and MD Wainwright, edited by JD Pearson (School of Oriental and African Studies, University of London), p. 222.
Alfred Milner, 1st Viscount Milner (1854-1925), High Commissioner South Africa, 1897-1905, Member of the Cabinet, without portfolio, 1916-18.
-- II. South African papers:
-- 1. Bound volumes containing official correspondence, telegrams, dispatches, printed reports, &c. Correspondents include Joseph Chamberlain, Lord Roberts, Cecil Rhodes, &c. 1897-1905. 77 vols.
-- 2. Mainly loose papers, comprising correspondence, memoranda, journal for part of 1901, papers concerning the Rhodes Trust, &c. This section also includes correspondence and diary of Henry Francis Wilson relevant to his years of service with Milner in South Africa (deposited with the Milner papers by Wilson's literary executors).
-- IV. Notebooks:
-- 1. Mainly South Africa. 1897-1901, 1898-9. 2 vols.
-- V. Diaries:
-- 2. Special diaries: South Africa. December 1924-February
-- IV. Notebooks:
-- 1. Mainly South Africa. 1897-1901, 1898-9. 2 vols.
-- V. Diaries:
-- 2. Special diaries: South Africa. December 1924-February 1925. 1 vol.
-- 3. Part of diary of Milner's wife describing South Africa. 1924-5?
-- VI. Biographical material, including notes on parts of Milner's life, compiled by his widow.
-- VII. Press-cuttings, South Africa. 1898-1903, 1906-10, 1926-9.
-- VIII. Printed Government papers, &c., relating, inter alia, to South and other parts of Africa.