- William Edward Griffiths: 'Memories of an Amlwch childhood' typescript memoir 1934-2001 (WM/1973)
- Gerald Norman Jones (1885-1958), Commodore RN: papers rel to maritime career (WD/9)
- John Parry, naval captain: papers rel to maritime career 1902-52 (WM/1971)
- RH Roberts: 'Atlas of Flowering Plants and Ferns of Anglesey' typescript, based on observations from 1955-2000 (WM/1986)
- RR Williams of Menai Bridge, local historian: papers and collections c1900-90 (WM/1976)
- Holyhead Railway: plans and financial records 1870-1980 (WCD/375-397, WM/2002)
- Thomas Williams, draper, Aberffraw: ledgers and day books 1892-1925 (WM/1983)
- Cymdeithas Bro Goronwy, Llanfair Mathafarn Eithaf: records 1979-92 (WM/2011)
- Cymdeithas Cymru Fydd Caergybi (addnl): records 1979-91 (WM/1247)
- Cyngor Eglwysi Llangefni: minutes 1959-72 (WM/2008)
- Efail Newydd Residents Association, Benllech: records 1967-2002 (WM/2001)
- Lady Thomas Convalescent Hospital, Rhosneigr: visitors book 1919-22 (WS (misc))
- Merched y Wawr, Anglesey: minutes 1967-98 (WM/1823/35-37)
- National Farmers Union, Anglesey branch: minutes 1956-79 (WM/1988)
- Newborough Parish Council: minutes 1908-53 (WM/59/8)
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