- Town End, Beaumaris: deeds 1786-1889 (WM/1928)
- Ysceifiog township: deed 1596 (WM/1914)
- Emlyn Stores, Gwalchmai: records (WM/1908)
- Richard Williams, coal merchant and motor proprietor, Gwalchmai: records (WM/1908)
- William Williams, sadler, Gwalchmai: records (WM/1908)
- Anglesey Embroiderers, Llanfairpwll branch: records 1992-2000 (WM/1940)
- Anglesey Music Trust/Ymddiriedolateth Cerdd Ynys Mon (addnl): records 1979-91 (WM/1850)
- Board of Trade and successors (addnl): marine maps and plans 1846-1976 (WCD/288-357)
- Penmon Society: minutes 1966-78 (WM/1904)
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