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

The Burnett Collection of children's literature was presented by Professor Mark Burnett (Queen's University Belfast) and contains books and annuals which were mostly published in the early to mid-Twentieth Century. It includes such titles as: Timothy's quest (1900), The boy's adventure book (1935), The Flying Five and other stories of adventure and school life (1936), and Girl's fun annual (1952).

Brian Alderson (b. 1930) is a pioneer of children’s literature studies in Britain as a distinguished author, reviewer, and translator. He has also collected books for more than 60 years, beginning when he was an undergraduate with cheap editions of work by poets Ezra Pound and T.S.Eliot. His interest in children’s books came later but soon became a lifelong passion, resulting in the curation of a collection of over 20,000 books, dating from the 17th century to the present day. This collection, donated jointly to the University and Seven Stories: The National Centre for Children's Books, represents a vast and diverse distinctive resource.

The Chorley Collection, presented by Sarah Chorley, comprises children's literature chiefly from the Nineteenth Century and first decades of the Twentieth Century. Highlights include Kate Greenaway's Almanack for 1884 (1883) R.M. Ballantyne's The Coral Island (1876) and The Giants and How to Fight Them (1904) by the Rev. Richard Newton. There are also several works by the highly influential children's book illustrator Randolph Caldecott (1846-1886).

The Wallis Collection contains books on mathematics and maths education and includes works by Robert Record (the man who introduced the = symbol), such as The grounde of artes: teaching the perfecte worke and practise of arithmetike (1582) and works by and about Isaac Newton, such as Newton's Principia in its first American edition (1846).

The books were formerly owned by Peter Wallis (1918-1992), a lecturer in the School of Education. There are almanacs, works on algebra and geometry, school text books, works on astronomy including J.F.W. Herschel's Astronomy (1835), guides to measuring, book-keeping, ready reckoners, treatises, Euclid's Elements and manuals.

Reporting the progress of their children at The Grange school, Hoddesdon. Also includes school reports of CPT, 2 copies the "Grange Gazette", and miscellaneous notes and maps of CPT's while at school

Letters from Warwickshire County Council and C B Burt of Snitterfield, with reference to the Lady Trevelyan Scholarship (biennial award, Snitterfield School, Warwickshire). Also, printed pamphlet: Warwickshire County Council, Education Committee, County Scholarship Scheme. Correspondents include C G Bone and C B Burth.

Includes school reports for CPT and GMT; also copies of the 1891 Bourchier prize examination papers

Newcastle University evolved from two colleges founded in the Nineteenth Century as part of the University of Durham, the School of Medicine and Surgery (established in 1834) and Durham College of Science (established in 1871, became Armstrong College in 1904). In 1937, the Newcastle Colleges became King's College and achieved independence from the University of Durham in 1963 when it became the University of Newcastle upon Tyne.The University Archive contains significant material relating to the development of Newcastle University and its predecessors. It includes Annual Reports, Senate and Council minutes and departmental publications covering many subjects.

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.