Original historical documents dating from the twelfth century to the present day relating to the area of West Cumbria bounded by the River Derwent in the North and the River Duddon in the South. The areas around Workington, Cockermouth, and Whitehaven are amongst those for which material is available. These include:
- Businesses and industries, including British Steel, National Coal Board and iron ore mining
- Shipping registers and crew lists for Whitehaven and Workington
- Church of England parishes, non-conformist churches
- Local Authorities and civil parishes
- Landed estates, including Curwen of Workington Hall and Pennington of Muncaster Castle, Solicitors, Societies.
- Official records and Schools