Some eighty letters, 1971-1976 (including some transcripts and copies) from John Barnard Jenkins to various correspondents, including Sarah Erskine and Ned Thomas (25), Robat Gruffudd and Elwyn Ioan (14) and Cyril Hodges (27). The letters were written during his imprisonment for offences including the possession of explosives and causing explosions and some were published in Williams, Rhodri (ed.): John Jenkins, Prison Letters (Tal-y-bont, 1981).

Nineteen letters (mostly copies), 1971-1973, sent by Cyril Hodges to John Jenkins during his imprisonment, together with one postcard from Jenkins's brother, Keith.

Correspondence and papers, 1970-1975, relating to John Barnard Jenkins's appeals to the Home Office and to the European Commission of Human Rights against the length and conditions of his sentence.

Some ninety-five letters, 1969-1977, to and from various correspondents, and arranged chronologically, relating to the imprisonment of John Barnard Jenkins and other nationalists, and including letters from members of the Free Wales Army imprisoned in 1969.