File comprises campaign ephemera including posters, leaflets, stickers and articles produced by pro-independence campaign group Yes Cymru. The file also contains material produced by other affiliated groups, including All Under One Banner AUOB and Welsh Football Fans for Independence and a special edition of The National newspaper produced for the independence march in Merthyr Tydfil in September 2019.

The file comprises a programme and attendance lift for a conference held at the University of Wales Aberystwyth in January 1969 on the economics of Welsh independence. The key speakers were Professor Leopold Kohr and Dr Edward Schumacher and a number of key individuals in political and cultural life attended.