- "Thames Bridges from Dartford to the source" by Neil Davenport, published by Silver link Publishing Ltd
- "The River Dee (Arfon Dyfrdwy) from Source to Sea" by Norman K Harvey, published by Countrywise Ltd
- "History of the River Dee" by Mike Griffiths, published by Gwasg Carreg Gwalch
- "Holt - a pictorial history" by B R Payne, Holt Local History Society
- "The Bridges of Wales" by Gwyndaf Breese, published by Gwasg Carreg Gwalch
- "The River Dee. Its aspect and history" by J S Howson and A Rimmer, published by the British Library, Historical Print Editions.
- "The Drovers' Roads of Wales" by Fay Godwin and Shirley Toulson, published by Wildwood House Ltd, London
- "Biographical Dictionary of Civil Engineers", published by the Institution of Civil Engineers.
- Red for Danger, The classic History of British Railway Diasters by L T C Rolt, published by Sutton Publishing
- "Telford in the Dee Valley" by C D R Jones and D Parry, published by Clwyd County Council.
- "North Wales Steam" by Peter Johnson, published by Ian Allan Publishing.
- "The Country Railway" by David St. John Thomas, published by David & Charles.
- http://www.buildinghistory.org
- http://www.cpat.org.uk/projects/longer/coastal/coastal.htm
- http://www.welshicons.org.uk/html/bangor-on-dee.php
- http://www.engineering-timelines.com/scripts/engineeringItem.asp?id=606
- http://en.wikipedia.org/wiki/A5_road_(Great_Britain)
- http://www.cyclingnorthwales.co.uk/pages/thom_tel_rd.htm
- http://freepages.genealogy.rootsweb.ancestry.com/~mossvalley/mv/holyhead-road.html
- http://holtlhs.weebly.com/chronology.html
- http://www.snapshots1952.weebly.com/unitedkingdom. html
- https://sites.google.com/site/saltneyhistory/industries/j-crichton-co-ltd
- CADW
- Listed Buildings Full Report 85251.pdf
- Listed Buildings Full Report 628.pdf
- Listed Buildings Full Report 656.pdf
- Listed Buildings Full Report 675.pdf
- Listed Buildings Full Report 696.pdf
- Listed Buildings Full Report 707.pdf
- Listed Buildings Full Report 1080.pdf
- Listed Buildings Full Report 1236.pdf
- Listed Buildings Full Report 1601.pdf
- Listed Buildings Full Report 1602.pdf
- Listed Buildings Full Report 1645.pdf
- Listed Buildings Full Report 1742.pdf
- Listed Buildings Full Report 4658.pdf
- Listed Buildings Full Report 4675.pdf
- Listed Buildings Full Report 14485.pdf
- Listed Buildings Full Report 19681.pdf
- Listed Buildings Full Report 84399.pdf
- Listed Buildings Full Report 84433.pdf
- Listed Buildings Full Report 85250.pdf
Helpful people
- George Thompson, artist
- John Thomas, Reference Librarian, Wrexham Library
- Brian Payne, Holt History Society
- CADW
- Dr Jessica Hughes, Historic Asset Records Management Officer, Cardiff
- Louise Mees, Regional Inspector of Ancient Monuments and Archaeology, SE Wales,
- Gethin W Jones, Senior Archives Assistant, Meirionnydd
Part of the Bridges Of Dee project.
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