Both his Gwyn Williams' historical and political writings are represented in his papers, along with a number of poems that do not appear to have been published. The core of the collection is Gwyn Williams' published and unpublished writings (GB 217 LAC/148/1), extending from his PhD thesis to his posthumously published autobiography. Also present are drafts of Latins in the Rain . The other sub fonds comprise research notes (GB 217 LAC/148/2), most relating to his study of Merthyr and on 19th century radicalism, papers relating to his television work with Teliesyn Ltd (GB 217 LAC 148/3), personal financial records and contracts (GB 217 LAC.148/4), a collection of slides and film (GB 217 LAC/148/5) some related to his research, and a miscellaneous sub fond (GB 217 LAC 148/7) consisting of mainly work by other authors. A separate sub fond (GB 217 LAC/148/6) has been created for primary source material relating to the trial of Lewis Lewis (Dic Penderyn) and Richard Lewis in 1831-2, about which Gwyn Williams had written in The Merthyr Rising 1831 . The provenance of these papers remains unclear.
The main value of this collection for researchers is the availability of Gwyn Williams'unpublished writings, especially on modern nationalism. They would be invaluable to any study of the British and Welsh Intellectual Left in the late 20th century.