The file is composed of electoral material and leaflets published by Plaid Cymru mainly during various general election campaigns between 1970 and 1992. Among them is a typescript copy of 'An Economic Plan for Wales' published by the party during 1970, and copies of 'Socialism and Nationalism in Wales' by Neil Evans, and 'Defeating Welsh Nationalism', November 1987, by Jon Vaughan Jones.

The file includes papers relating to miners, Socialism, and science and technology.