Biographical material includes the draft of Mourant's autobiography, Blood and Stones published after his death in 1995, together with the correspondence and papers Mourant assembled while writing it. There is also documentation of Mourant's education at Victoria College Jersey and at Exeter College Oxford. The latter includes notes on lectures 1922 - ca 1926. Documentation of Mourant's career, honours and awards is patchy, although there is material relating to his search for employment in the early 1930s. There are pocket diaries spanning 1915-1982, with a fairly continuous sequence 1922-1961. Biographical material also includes extensive family and personal correspondence, much of which dates from or relates to the German occupation of Jersey or shortly thereafter. Mourant's other documented interests include his membership of the Methodist Church and his political affiliations, the League of Nations Union in particular.

There is a little material relating to Mourant's early career with the Geological Survey 1929-1931, miscellaneous material relating to Mourant's service with the MRC's Blood Group Reference Laboratory at the Lister Institute and the Nuffield (later Anthropological) Blood Group Centre at the Royal Anthropological Institute, London, and more extensive but uneven coverage of the Serological Population Genetics Laboratory. Although there is some documentation of the foundation of the Laboratory 1964-1965 and of its staff, the surviving material consists chiefly of correspondence and papers relating to Mourant's largely successful efforts to find continued funding for the Laboratory 1969-1977. Haematological research material, though not extensive, covers Mourant's work in a number of areas from research on blood serum in the mid-1940s to the mapping of blood groups in the 1960s and 1970s. There are early research notes, correspondence and papers relating to student and other expeditions undertaking blood group and physical anthropology research and some MRC material assembled by Mourant relating to projects in which he had an interest. The largest group of research papers, however, is maps and data produced during preparation of the second edition of The Distribution of the Human Blood Groups. There is a chronological sequence of drafts and correspondence relating to Mourant's publications, 1929-1991, with extensive material relating to editions of The Distribution of the Human Blood Groups and to The Genetics of the Jews (1978). There is also editorial correspondence relating to publishers and journals, chiefly invitations to review books or referee papers and an incomplete set of offprints. There is correspondence and papers relating to some of Mourant's lectures and broadcasts, most notably the lectures on blood groups given at the Collège de France, Toulouse, 1978-1979. Societies and organisations material is not extensive, and is confined to brief documentation of only a few of the societies and organisations with which Mourant was associated. It includes professional and geological bodies as well as haematological, biological and medical organisations. Visits and conferences material covers the period 1960-1987. It is not comprehensive, though there is also considerable documentation of Mourant's visits and conferences in the papers he assembled in the course of preparing his biography and with lectures material. Mourant's correspondence is extensive. Its complexity reflects Mourant's organisation of the material, the bulk of which was found in three main series: 'Foreign 1965-1977', 'Biological' and 'Geological', together with a fragment of a fourth series 'Home 1965-1977'. Principal correspondents include C.C. Blackwell, B. Bonné, O.J. Brendemoen, V.A. Clarke, L.L. Cavalli-Sforza, A. W. Eriksson, T.J. Greenwalt, J.K. Moor-Jankowski, T. Jenkins, W.S. Pollitzer, D.F. Roberts, J. Ruffié, D. Tills and J.S. Weiner.

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.

The correspondence, papers and diaries of Sir Charles Blagden. Blagden's papers are interesting on several levels, generally for his close contact with European men of learning, and his relationship with Sir Joseph Banks. Blagden's professional researches are represented by medical notes in the boxed sequence. These are grouped with papers on other subject interests, including linguistics, e.g. a draft Tahitian-English dictionary, compiled from conversations with Omai, whom Blagden inoculated after Omai's voyage to England with James Cook. Blagden's interest in antiquities and travel is documented by diary entries, as is his intercourse with fellow scientists, particularly those associated with the founding of the Royal Institution.