Comprises material relating to the the campaign to ensure that devolution proposals for Wales were included in legislation and the financial affairs of the pro devolution campaign in Ceredigion.

The archive comprises election ephemera, including election addresses, posters, drafts of election material, mostly for Plaid Cymru candidates for UK Parliament and local elections, along with some ephemera related to anti-nuclear weapons and anti-nuclear power campaigns and Plaid Cymru publications.

Speech notes and related material regarding the 1999 St David's Day debate which took place 26 February of that year.

Material, including reports, strategies, proposals and correspondence, relating to the Welsh devolution referendum of 1997.