The collection consists of a bound volume of 161 papers - letters to and from Alltud Eifion and other family members, 1830-1861, various receipts for Tyddyn Iolyn, 1754-1821, details regarding the payment of tithes in the parish of Ynyscynhaearn as well as the papers of Owen Jones as Overseer of the Poor for the parish, 1829-1844.
A petty cash book, 1828-1863 and rent book, 1729-1784 for Tyddyn Iolyn.
A survey of the parish of Ynyscynhaearn for 1823 with the names of tax payers, and an assessed taxes book for 1854.
A sunday school minute book for Brynmelyn (C. M.) Chapel in Treflys, Caernarfonshire 1819, 1824 and 1827.
A photocopy of a volume of hymns, englynion, elegies and verses by Alltud Eifion.