- Treasurers' books
- Is-gyfres
- 1877-1970.
Rhagolwg argraffu Cau
Dangos 1217 canlyniad
Disgrifiad archifolTremadog Sunday school records,
- Tremadog Sunday school records
- Is-gyfres
- 1934-1983.
Additional group of (unbound) Trevecka letters,
- Trevecca College I/2787a-2944.
- Is-gyfres
- 1730-1790.
- Trevecca College I/2945-2999.
- Is-gyfres
- 1743-1744.
Accounts of societies sent to Associations,
- Trevecca College I/3000-3085.
- Is-gyfres
- 1741-1750.
Letters written to Associations and Societies,
- Trevecca College I/3086-3112.
- Is-gyfres
- 1738-1748.
- Trevecka letters 1-199.
- Is-gyfres
- 1725-1739.
- Trevecka letters 1207-1372.
- Is-gyfres
- 1744-1745.
- Trevecka letters 1373-1503.
- Is-gyfres
- 1745-1746.
- Trevecka letters 1504-1665.
- Is-gyfres
- 1746-1747.
- Trevecka letters 1666-1852.
- Is-gyfres
- 1747-1749.
- Trevecka letters 1853-1991.
- Is-gyfres
- 1749-1751.
- Trevecka letters 1992-2176.
- Is-gyfres
- 1751-1756.
- Trevecka letters 200-431.
- Is-gyfres
- 1739-1741.
- Trevecka letters 2177-2349.
- Is-gyfres
- 1756-1761.
- Trevecka letters 2350-2530.
- Is-gyfres
- 1761-1762.
- Trevecka letters 2531-2684.
- Is-gyfres
- 1762-1770.
- Trevecka letters 2685-2787.
- Is-gyfres
- 1770-1797.
- Trevecka letters 432-711.
- Is-gyfres
- 1741-1742.
- Trevecka letters 712-979.
- Is-gyfres
- 1742-1743.
Canlyniadau 1181 i 1200 o 1217