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Amgueddfa Cymru – Museum Wales
Plan: Wyndham Pit strata & surface arrangement, with mineral estate of John Brogden & Sons. Also positions of South Wales collieries and Tondu works. Scales 60':1" and 1/8":1', 1870.
Section of Wyndham pit and map of South Wales coalfield showing the Brogden mineral estate (1870).
