Papers of John Legonna, including correspondence with Per Denez, Alan Heusaff, Goulven Pennaod (George Pinault), Harri Webb and others; diaries; poetry; prose; autobiographical notes and personal reflections; farming records; college notes on Welsh and Irish history and law; material relating to Legonna's political views and his activities with Welsh and Celtic nationalist organisations, especially Mudiad Gweriniaethol Cymru (Welsh Republican Movement), the Welsh National Party, and the New Nation Movement and its journal, 'Cilmeri'; printed and cyclostyled ephemera; personal and family records; miscellaneous printed material relating to Christopher Murray Grieve, 'Hugh MacDiarmid'; programmes for local eisteddfodau at Llannon and Llanrhystud; and typescript drafts of unpublished plays.

Papers, 1839-1971, relating to farming in Cardiganshire, including agricultural notebooks, 1839-1919, accounts for payments to servants, 1879-1894, accounts of live and dead stock, 1879-1887; business letters, 1890-1918, letters to Richard Phillips, 1890-1901; personal letters, 1868-1971; literary material, late 19th cent.-1940; domestic accounts, 1898-1930; diaries, 1898-1954; papers relating to Tabor Calvinistic Methodist Chapel, Llangwyryfon, 1860-1926; and to Talybont school, and Llanilar parish council papers, 1892-1899.