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Notebook, 1818-1841, of Sir John Guest containing various memoranda relating mainly to the iron and coal industries, including analysis of iron ores and various technical data; notes of tonnage of iron made at Dowlais and transported by canal; record of prices of bar iron; numbers of men, boys and girls working at Dowlais, 1818; together with a few political notes, notably an estimate of 'supposed influence in Glamorgan Boroughs'.