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Amgueddfa Cymru – Museum Wales
Plan of Ynysfach Iron Works. 28.5.24 Surveyors office Cyfarthfa. A cast iron plate secured to the keystone of the Arch of No.3 furnace gives the year as 1836 (WC 1836) this refers to No. 3 & No.4, No.1 & No.2 were constructed earlier, presumably 1800. Traced by A. Williams 1966
