A biography of his father by David Roberts, Dol-y-wern, Glynceiriog, 1867; two essays on 'Yr Enfys', written for the Bryneglwys eisteddfod, 1830, one by Hugh Jones, Glaneurfin, Llangollen, and the other by 'Trebor Newroc'; lexicographical notes by Robert Ellis; question papers and examination results at Clwyd Bank College, Ruthin, 1871; pedigree of Pantglas family, Llanrhaeadr-ym-Mochnant; notes of loans by Robert Ellis to William Roberts ('Nefydd'), 1853, and Robert Edwards, 1854; and a snapshot of Llanddulas Baptist chapel.