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Amgueddfa Cymru – Museum Wales
Diazo print of a small map entitled 'Plan Shewing Pits and Levels on Brymbo Estate'. typed mss headed 'The Story of Brymbo. Chapter 1. Early Times', and covering from the Roman to the early 19th century, concentrating mainly on Brymbo Works from the late 18th century to the mid 19th century. (Note that the interpretative chronological chart and also the 28 pages of notes on each pit that accompanies this are accessed as 2006.32/162-163).