- Bala College I/233-235.
- Is-gyfres
- 1816-1817.
Dangos 1217 canlyniad
Disgrifiad archifol- Bala College I/230-232.
- Is-gyfres
- 1814-1818.
Notebooks containing minutes of Associations,
- Bala College I/210-229.
- Is-gyfres
- 1810-1828.
Constitutional Rules and a Confession of Faith,
- Bala College I/201-209.
- Is-gyfres
- 1819-1823.
- Bala College I/183-200.
- Is-gyfres
- 1818-1844.
Letters from J. Bickerton Williams, Shrewsbury, to John Davies,
- Bala College I/173-182.
- Is-gyfres
- 1827-1831.
Letters from John Wilks, Finsbury Place,
- Bala College I/146-172.
- Is-gyfres
- 1824-1829.
Letters from John Elias to John Davies,
- Bala College I/129-145.
- Is-gyfres
- 1813-1833.
- Bala College I/109-128.
- Is-gyfres
- 1805-1841.
- Bala College I/108.
- Is-gyfres
- 1825-1827].
- Bala College I/91-107.
- Is-gyfres
- 1807-1826.
- Bala College I/48-90.
- Is-gyfres
- 1795-1836.
Letters written to Associations and Societies,
- Trevecca College I/3086-3112.
- Is-gyfres
- 1738-1748.
Accounts of societies sent to Associations,
- Trevecca College I/3000-3085.
- Is-gyfres
- 1741-1750.
- Trevecca College I/2945-2999.
- Is-gyfres
- 1743-1744.
Additional group of (unbound) Trevecka letters,
- Trevecca College I/2787a-2944.
- Is-gyfres
- 1730-1790.
- Trevecka letters 2685-2787.
- Is-gyfres
- 1770-1797.
- Trevecka letters 2531-2684.
- Is-gyfres
- 1762-1770.
- Trevecka letters 2350-2530.
- Is-gyfres
- 1761-1762.
- Trevecka letters 2177-2349.
- Is-gyfres
- 1756-1761.
Canlyniadau 1181 i 1200 o 1217