- Lloyd family of Plas Cilybebyll (addnl): papers 20th cent
- Lyons (formerly Penrice) family of Kilvrough (addnl): papers 1712-1918
- Martin family of Ynystawe (addnl): papers 1840-1917
- Morris family, baronets, of Clasemont and Sketty Park: survey 1874
- Talbot family of Margam and Penrice Castle (addnl): estate rentals and labour books 1880-1958
- Dylan Thomas, poet and prose writer: ms of radio broadcast 'The Outing'
- Evan Evans Bevan Ltd, brewers, wine and spirit merchants, Neath: records 1919-72
- Neath Abbey Iron Co (addnl): plans 19th-20th cent
- South Wales colleries: records (South Wales Miners Museum)
- Taylor & Sons Ltd, ferrous and non-ferrous castings manufacturers, Briton Ferry (addnl): plans 19th-20th cent
- Aberavon Wesleyan Methodist Circuit: records 1867-1980
- HM Prison, Swansea: records 1877-1952
- Llansamlet Ward Labour Party: records 1928-82
- Neath Abbey: charter of confirmation granted by Henry, bishop of Llandaff c1200
- Post Office Engineering Union/Union of Communication Workers, Swansea branch: records 1924-83
- St John's Ambulance Association and Brigade, Glyncorrwg division: records 1927-69
- Swansea and West Wales Medical Womens Federation: minutes 1968-89
- Swansea borough: records incl municipal charters and minute books 1234-1852
- Swansea Grammar School: records 1813-92
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