The Cowen Tracts are almost two thousand pamphlets which were formerly owned by local (radical) M.P., Joseph Cowen (1829-1900). The tracts date mostly from the mid- to late-Nineteenth Century and reflect Cowen's interest in the social, educational, political and economic issues of the day.

There is some earlier material, such as Deed of incorporation for the insurance of ships printed by T. Angus, St. Nicholas' Church-Yard, Newcastle (1778). Pamphlets were an effective form of public debate because they could be circulated to a wider audience than books and authors could remain anonymous. The Cowen Tracts discuss Irish politics, foreign policy, women's rights, religion, education and public health and include such titles as The Union programme for 1880: constructive, not destructive, Irish legislation [1879?], Are women fit for politics?: are politics fit for women [185-] and The education of the agricultural labourer: a paper read before the Morpeth Chamber of Agriculture, on Wednesday, Feb. 2, 1870 by M.W. Ridley (1870).

Books on Arabic and Persian languages, and on the history and antiquities of Arabia, Iraq and the Near East that formed part of Gertrude Bell's working library.

The Grey Tracts reflect the interests of their former owner, the 2nd Earl Grey (1764-1845) whose Whig government was responsible for the 1832 Reform Act, 1833 Factory Act and the 1834 Poor Law Amendment Act. The pamphlets cover a broad range of historical, social and economic subjects including colonial policy, public finance and banking, the Corn Laws and agriculture, poor relief, slavery, Catholicism, Ireland and the Greek Revolution.

The Robert Spence Watson Collection is a collection of 500 volumes on the subject of English literature, consisting largely of the publications of literary societies such as the Shakespeare Society, the Spenser Society, the Ballad Society and the Chaucer Society, presented to the Library in 1908 by Robert Spence Watson, who was also one of the founders of the Durham College of Physical Science, and President of Armstrong College.

This archive includes content accumulated and created by both Charles and Mary, and other family members. It reflects the family's personal activities from Charles' childhood in the 1870s to Mary's death in 1966, but also includes some content from Charles' professional life. It can support research into a broad variety of areas, including political history (particularly the Liberal and Labour parties, socialism and international relations), World War I (particularly dissent and the peace movement), childhood and education (from both a personal and political perspective), domesticity, class and landed estates.
This extensive personal archive is mostly comprised of correspondence. This includes: Correspondence to Charles in his role as MP Correspondence to and from Charles relating to the operation of the Union of Democratic Control Correspondence to and from Charles relating to his positions in government Correspondence relating to the management of the Wallington estate and the donation to the National Trust Correspondence between members of the Trevelyan and Bell families, much of which is domestic in tone Correspondence to and from Charles and Mary's children from their early childhood to adulthood Correspondence from visits abroad including North America, Australia, New Zealand, the Middle East, Russia and Germany The correspondents include family members such as Charles' brothers George Macaulay Trevelyan and Robert Calverley Trevelyan, Mary's sister and brother in law Elsa Richmond and Admiral Sir Herbert William Richmond. Other correspondents include Sir Winston Churchill, J Ramsay MacDonald, E D Morel, Arthur Ponsonby, Walter Runciman, Herbert Samuel, George Bernard Shaw and Jennie Lee.

Other documents include: Papers relating to Charles, Mary and their childrens' educations, including exam papers and school ephemera Personal Diaries, in particular a short run of Mary's personal diaries as a young woman Official political papers, including Cabinet Conclusions, draft bills[?] and copies of Hansard Pamphlets and leaflets written by and collected by Charles, many relating to socialism and the UDC Transcripts of speeches given by Charles and Mary in professional and personal capacities Personal notebooks with draft speeches and essays Family photograph albums and glass negatives, recording family events, daily life, and Charles' political career Press cuttings and scrapbooks relating to family events and Charles' career

34 items. Includes letters from contemporaries of Williams, including letters sent in support of job applications. Also includes a number of photographs of Williams throughout her life, objects connected to the suffrage movement, and selected information about Williams collected after her death.

Consists mainly of letters to Robert Spence Watson. Topics include, but are not limited to, British politics and the Liberal party, contemporary Europe, Armstrong College (later Newcastle University), the Peace Society, lectures at the Literary and Philosophical Society of Newcastle upon Tyne, and contemporary literary and scientific achievements. Other regular recipients of letters include Elizabeth Spence Watson, Frederick Weiss, and Charles Prestwich Scott.

The Spence Watson's wide-ranging public activism, make their correspondence a valuable source of opinions on the social and political matters of the day from a wide range of prominent persons.

With three early twentieth century exceptions, the Indian Tracts is a collection of nineteenth century pamphlets on a range of Indian subjects, such as local self-government, the Indian Civil Service, education, politics, economics, transport, the trade of opium, religion and war.

The archive mainly comprises correspondence relating to Charles' activities as a Civil Servant and administrator. There are also publications relating to these activities and Charles' wider interests.

There is also personal content, including travel diaries, family correspondence and papers regarding inheritance of the Wallington estate in Northumberland.

Comprising most of family correspondence, with some content relating to estate and property and George Otto Trevelyan's political career. Also includes autographs and cuttings of notable figures.