Comprises:
- Copy of report and estimate relating to proposals for draining Malltraeth Marsh in 1787
- A plan of the allotments of Malltraeth/Cors Ddyga Marsh, 1790
- A map of the coal works and strata, Anglesey coal basin and allotments on Malltraeth/Cors Ddyga Marsh, no date
- File of correspondence and papers relating to A Bill to alter, amend and extend the Acts for inclosing, embanking and draining the Marsh called Malltraeth and Cors Ddyga in the county of Anglesey, and to provide for the maintenance of the Embankments and Drainage, 1859
- Accounts and letters relating to the Malltraeth Marsh Drainage Commissioners, 1859-1918