Extracts from, together with abstracts and translations of, records, 13 cent.-19 cent., relating to the Mawddach (Abermo) Fishery, co. Mer., held at the Public Record Office, now The National Archives, including Patent and Close Rolls, Ministers' Accounts, Land Revenue Enrolments and Accounts, Court of Augmentation Proceedings; Rentals and Surveys; Plea Rolls, and Exchequer Depositions; together with abstracts from, and transcripts of, deeds from the Peniarth and Nannau estates. Also included is the legal opinion, 1923, of Nathaniel Micklem, KC, and John Harmen, in the case Vaughan v Jones regarding the said fishery.