- National Library of Wales (Aberystwyth): www.llgc.org.uk
- Caernarfon Record Office: www.gwynedd.gov.uk
- Gwydir Castle: www.gwydircastle.co.uk
- Dolwyddelan castle: www.castlewales.com/dolw.html
Literatuur
- Sir John Wynn, The history of the Gwydir family and memoirs (1990)
- Calendar of Wynn papers 1515-1690 (National Library of Wales, 1926)
- Llanrwst: the history of a market town, Tucker (2002)
- Gwydir mines & quarries – Mines of the Gwydyr Forest, Bennett & Vernon, parts 1-7 (1989-1997)
- The mines of Anglesey and Caernarvonshire, Foster-Smith (1977)
- An account of a mine adventure by John Royle on the Gwydir estate 1775-1784, Bennet in British Mining no 23 (1983)
- Wilkinson’s Gazetteer and Bibliography of the Mines and Quarries of North Wales (2004)
- National Library of Wales (Aberystwyth): www.llgc.org.uk
- Caernarfon Record Office: www.gwynedd.gov.uk
- Gwydir Castle: www.gwydircastle.co.uk
- Dolwyddelan castle: www.castlewales.com/dolw.html
Literatuur
- Sir John Wynn, The history of the Gwydir family and memoirs (1990)
- Calendar of Wynn papers 1515-1690 (National Library of Wales, 1926)
- Llanrwst: the history of a market town, Tucker (2002)
- Gwydir mines & quarries – Mines of the Gwydyr Forest, Bennett & Vernon, parts 1-7 (1989-1997)
- The mines of Anglesey and Caernarvonshire, Foster-Smith (1977)
- An account of a mine adventure by John Royle on the Gwydir estate 1775-1784, Bennet in British Mining no 23 (1983)
- Wilkinson’s Gazetteer and Bibliography of the Mines and Quarries of North Wales (2004)