Records of the Prisons Committee, Court of Aldermen, comprising minutes and papers of the Committees of the Court of Aldermen appointed to consider prison affairs, 1794-1797; minutes of the Committee of Aldermen appointed to enquire into the number and state of the prisoners in the gaols of the City, 14 Dec 1784 - 1 Feb 1785 and minutes of the Committee to examine the allegations by the keepers of Newgate, Ludgate and the two Compters as to the Act for taking away liquour taps in the prisons, 1786-1787.

Manifestos, speeches, pamphlets, leaflets, letters, newsletters, journals, posters, press releases and miscellaneous election material at national, local and youth levels issued by the African Democratic Party (South Africa), the African National Congress, the African National Congress Youth League, the Azanian Students' Organisation (South Africa), the Congress of the People, the Conservative Party (South Africa), the Defenders of the Constitution (South Africa), the Democratic Party (South Africa), Denis Worrall, the Episcopal Churchmen for South Africa, the Freedom Front (South Africa), the Freedom Party (South Africa), the Herstigte Nasionale Party van Suid-Afrika, Independent Candidates, the Independent Party (South Africa), the Inkatha Freedom Party, the Labour Party of South Africa, the Liberal Party of South Africa, National Conservative Party (South Africa), the National Party (South Africa), the Non-Racial Franchise Association, the New Republic Party (South Africa), the Pan Africanist Congress of Azania, the Progressive Federal Party (South Africa), the Progressive Federal Party (South Africa) Youth Movement., the Progressive Party of South Africa, Revolutionary Party (South Africa), the South African Coloured People's Congress, the South African Communist Party, the South African Congress of Democrats, the South African Labour Party, the South African Progressive Reform Party, Umkhonto we Sizwe, the United Democratic Front (South Africa), the Union Federal Party (Natal), the Unification Movement (South Africa), the United Party (South Africa), the Unity Movement of South Africa, and the Vigilance Association (Orlando, South Africa).

Papers, c1914-1989, of Dame Kathleen Lonsdale.

Biographical material includes correspondence and papers relating to imprisonment in Holloway Prison, with Lonsdale's own accounts of her time there; diaries and personal notebooks, 1946-1969; letters of congratulation on election as Fellow of the Royal Society (1945); various photographs dating from school to her later years.

Papers relating to Lonsdale's teaching and administrative work at University College London include papers on teaching undergraduate and postgraduate courses; significant documentation relating to laboratory personnel, research funding and general university administration; papers relating to the 'Round Table on Peace Studies', which proposed the establishment of a centre for research into international conflict at the University.

Research material, 1924-1970, consists of Royal Institution papers comprising notebooks, one dating from Lonsdale's first period there (1923-1927), correspondence with colleagues such as W H Bragg and J M Robertson, and Lonsdale's notes and drafts for various research topics; correspondence and papers from her University College years covering many different areas of research, including diffuse scattering of X-rays, thermal vibrations in crystals, methonium compounds and urinary calculi (the latter topic particularly well documented and including several case studies), and including a large group of photographs, mostly of X-ray diffraction patterns.

Papers on the preparation of volumes of the International Tables for crystal structure determination from Lonsdale's chairmanship of the Commission on Tables (1948) comprise drafts, notes and correspondence with colleagues and publishers.

Extensive papers relating to publications, lectures and broadcasts include drafts of articles, on subjects including peace and religious issues, also including obituaries and biographical articles on various individuals, books, book reviews, obituaries, and letters to newspapers and magazines, the latter principally on the issue of atomic weapons; general correspondence concerning publications; drafts of lectures, 1945-1970, including ethics and the role of science in society; a large series of lecture notes, 1933-1970; scripts for broadcasts, on topics ranging from crystallography to religion, 1945-1967.

Papers on foreign and domestic travel, 1943-1971, relating to conferences and lectures, on crystallography, science ethics, and work for the Society of Friends, including her visit to China (1955) and her world tour (1965).

Papers relating to organisations, notably the British Association for the Advancement of Science (BAAS) and the International Union of Crystallography (IUCr), including material relating to a number of International Congresses of Crystallography, also papers relating to participation in Pugwash Conferences on World Affairs, 1958-1970, and papers concerning prison reform and the running of Bullwood Hall Borstal, Essex.

Correspondence, 1927-1974, comprises two main sequences, one arranged alphabetically, the other chronologically; 'day files', principally carbons of outgoing correspondence, 1966-1969; a sequence of references and recommendations; also including correspondence relating to Lonsdale's period of imprisonment (1943). Correspondents include scientists such as Max Born, W H Bragg, W L Bragg, E G Cox, Dorothy Hodgkin, Judith Milledge, L C Pauling and A J C Wilson.