BALFOUR PAPERS. Vol. XCVIII (ff. 260). P. W. A., afterwards Sir Percy, Ashley, and papers on Tariff Reform; 1903-1909. Sir Percy Walter Llewellyn Ashley, KBE: Correspondence with A. J. Balfour: 1903-[1909].
BALFOUR PAPERS. Vol. XCVII (ff. 304). William Albert Samuel Hewins, M.P.; 1907-1917. William Albert Samuel Hewins, MP; Secretary, Tariff Commission: Correspondence with A. J. Balfour: 1907-[1917].
BALFOUR PAPERS. Vol. CXXV (ff. 275). Gen. Sir Redvers Buller, V.C.; 1886-1888. General Sir Redvers Henry Buller, GCB: Correspondence with A. J. Balfour: 1886-1888.
BALFOUR PAPERS. Vol. CXXXII (ff. 338). Sir Peter O'Brien, Baron O'Brien; 1888-1911. Sir Peter O'Brien, Baronet; Baron O'Brien: Letters to A. J. Balfour: 1888-1911.
BALFOUR PAPERS. Vol. CLI (ff. 401). Letters to Balfour from Blanche Dugdale, followed by correspondence and papers relating to the biography; 1916-1936.