The file comprises correspondence, press-cuttings and related documents, mainly regarding opinion polls and election data. Includes a paper entitled "The People of Penparcau on the NHS: A Plaid Cymru Survey", November 1985; a paper by Paul O'Leary entitled "Ceredigion a Gogledd Penfro: Disgrifiad o'r etholaeth", June 1986; Beaufort Research Ltd: "Wales Opinion Poll Data", June 1987; a typescript article "The 1987 General Election in Wales", probably by Denis Balsom; a letter by Cynog Dafis dated 21 February 1990 regarding opinion poll questions; a paper by Cynog Dafis on he proposed pact between Plaid Cymru and the Green Party dated 4 September 1990, papers on the Plaid Cymru/Green election campaign, 1991-2, including the controversies over Aber Research opinion poll data and statistics gathered at the count, April 192 and post 192 election data and papers.
It also includes a paper entitled "The Ceredigion County Campaign: Draft Basic Policy Paper" by Ken Jones and Iolo ap Gwynn dated 17 July 193; papers relating to the Plaid Cymru Valleys Conference held at Hirwaun on 4 December 1993; a discussion paper by Marc Phillips "Pwyllgorau rhanbarth Dyfed yn sgil ad drefnu llywodraeth leol a seneddol, 194; discussion papers and documents by Aber Research in preparation for the 1997 General Election campaign including a paper by Gwyn Jenkins, 22 December 1992 "Yr Etholiad Nesaf: Rhai Ystadegau Defnyddiol" and various General Election campaign papers.