An account book of Morris Jones, Cwmpenllydan, overseer of the poor in the lower division of the parish of Llanbrynmair, 1810.

Title deeds of properties in Llandinier, Berriw, 1577, Graig in Kerry, 1591-1596, Dolgadfan and Pennant Tywym, Llanbrynmair, 1545, 1547, 1570, 1585; and a letter of attorney by Sir Robert Owen to take livery of seisin of lands in Cemais, 1690.

A list of Cemmaes rectors from 1537 to 1906 and a transcript of the parish registers of Cemmaes, Montgomeryshire, 1711-1780, both in the hand of Richard Bennett, together with notes in the hand of D. C. Lloyd-Owen of some Llanbrynmair wills.

The Llanbrynmair Congregational church covenant (Cyfamod eglwysig a gytunwyd arno gan y gymdeithas gynnulleidfaol o ymneullduwyr protestanaidd yn Llanbrynmair), with a list of members, written by John Roberts circa 1798, and The names of the children belonging to the school sent to Dr. Williams Trustees, Feb. 19th, 1810.

A ledger, 1858-1892, kept by David Peate (1831-1896), carpenter and wheelwright, of Tafarnnewydd and Glanllyn, Llanbrynmair, Montgomeryshire.

Account sheets of churchwardens of the parish of Llanbrynmaire, Montgomeryshire, 1708-1743 (with gaps) and undated.

Marriage licences granted by the Bishop of St Asaph for a marriage to be solemnized at Llanymawddwy, county Merioneth, 1787, and at Llanbrynmair, Montgomeryshire, 1810.

Transcripts of the parish registers of Penegoes, Montgomeryshire, 1763-1812; extracts from the parish registers of Cemmaes, Montgomeryshire, 1711-1754; lists of Darowen farms and tenants in 1801; notes taken from Darowen and Llanbrynmair, Montgomeryshire rent rolls, 1634; etc.

Notes of sermons preached at Llanbryn-mair; sermons by Samuel Roberts and others; poetry and hymns; and miscellaneous notes and accounts.

Llyfr casglu Apel y Capeli Annibynol Cymreig y Parch. Evan Jones, Trelech, gyda tystlythyrau a manylion casgliadau yn yr Alban ac Iwerddon, Mawrth-Ebrill 1835 (ff. 2-11), a ddefnyddiwyd wedi hynnu gan Samuel Roberts fel llyfr nodiadau, [?1864]. = A Welsh Congregational Churches Appeal Fund collecting book of the Rev. Evan Jones, Trelech, with testimonials and details of collections in Scotland and Ireland, March-April 1835 (ff. 2-11), subsequently used by Samuel Roberts as a notebook, [?1864].
Yn cynnwys adysgrifau anghyflawn, [?1864], o 'Anerchion byrion wrth Fwrdd y Cymundeb' gan S.R. (ff. 12 verso-38 verso, 49-60), ac anerchiad i gyfarfod gweddi yn Birmingham yn Chwefror 1835 (ff. 42-48). Cyhoeddwyd rhain yn Samuel Roberts, Pregethau, areithiau a chaniadau (Utica, E.N., 1864), tt. 53-65, 71-75, 80-86, 221-224. = Contains incomplete transcripts, [?1864], of communion addresses by S.R. (ff. 12 verso-38 verso, 49-60), and of 'Outlines of an Address at the United Missionary Prayer Meeting in Birmingham' from February 1835 (ff. 42-48). There were published in Samuel Roberts, Pregethau, areithiau a chaniadau (Utica, N.Y., 1864), pp. 53-65, 71-75, 80-86, 221-224.