Papers, 1830-1930, of or relating to John Thomas (Pencerdd Gwalia), including original musical manuscripts, mainly compositions and arrangements for the harp, 1853-1905; correspondence mainly relating to his concerts, compositions and travels, and to musical circles in London and Wales, 1842-1930; journals of European concert tours, 1851-1883; concert programmes, 1851-1905; papers of his wife, Joan Frances Thomas, 1878-1926, including tour journals, 1878-1883; and passports, 1873, 1885.