Papurau y Parch. D.J. Roberts, c. 1833-1977,yn cynnwys deunydd a defnyddiodd wrth ymchwilio i hanes Capel Mair, ac a gyhoeddwyd dan y teitl Capel Mair, Aberteifi (Llandysul,1955), a hefyd gohebiaeth a nodiadau, 1905-1971, yn ymwneud â bywgraffiad o Dr Peter Price, a gyhoeddwyd dan y teitl Cofiant Peter Price (Abertawe, 1970), ynghyd â deunydd, 1974-1977, yn ymwneud â threfnu'r eisteddfod genedlaethol yn Aberteifi = Papers of the Rev. D. J. Roberts, 1833-1977, comprising materials used in his research on the history of Capel Mair, which was published as Capel Mair, Aberteifi (Llandysul, 1955), and also correspondence and notes, 1905-1971, relating to his biography of Dr Peter Price, published as Cofiant Peter Price (Swansea, 1970), together with material, 1974-1977, relating to the organisation of the 1976 national eisteddfod at Cardigan.