Deunydd amrywiol = Miscellaneous material
Deunydd amrywiol (oddieithr gohebiaeth) sy'n ymwneud yn uniongyrchol neu'n anuniongyrchol â Mary a Robert (Silyn) Roberts. = Miscellaneous material (other than correspondence) either directly or indirectly relating to Mary and Robert (Silyn) Roberts.
Gohebiaeth bersonol a swyddogol Mary Silyn Roberts a'i gŵr Robert (Silyn) Roberts, gan gynnwys gohebiaeth rhwng Mary a Silyn yn dyddio o'u perthynas cynnar ym mlynyddoedd olaf y bedwaredd ganrif ar bymtheg hyd at fis cyn marw Silyn ym 1930; gohebiaeth gydag aelodau teuluol a chyda chyfeillion a chydnabod ledled y byd; a gohebiaeth rhwng cangen Gogledd Cymru o Gymdeithas Addysg y Gweithwyr a Choleg Harlech; ynghyd â llythyr oddi wrth y bardd R. Williams Parry at y newyddlen Y Dinesydd Cymreig. = Personal and official correspondence of Mary Silyn Roberts and of her husband Robert (Silyn) Roberts, which includes correspondence between Mary and Silyn dating from their early relationship in the closing years of the nineteenth century to a month prior to Silyn's death in 1930; correspondence with family members and with friends and acquaintances worldwide; and correspondence between the Workers' Educational Association and Coleg Harlech; together with a letter from the poet R. Williams Parry to the Welsh newspaper Y Dinesydd Cymreig.