This machine-readable version of John Williams' <i>Digest of Welsh Historical Statistics</i> is the result of a collaboration between the Statistical Directorate of the National Assembly for Wales, the History Data Service and the Centre for Data Digitisation and Analysis at Queen's University Belfast. John Williams' <i>Digest of Welsh Historical Statistics</i> is intended to provide a service for those working on the history of modern Wales. It arises from a belief that the quantitative element is a necessary and important part of the historical record; from an awareness that it was an aspect that was particularly inaccessible for scholars of Welsh history; and from a conviction that some encouragement in the use of quantitative material was necessary. It is modelled on the two volumes dedicated to British historical statistics: Mitchell, B.R. and Deane, P. (1962) <i>Abstract of British historical statistics</i> and Mitchell, B.R. and Jones, H.G. (1971) <i>Second abstract of British historical statistics</i>. Iron. Number of works and furnaces, North Wales and South Wales, 1740-1974 Amount and value of iron ore mined in North Wales, 1855-1920, and South Wales, 1855-1971 Pig iron production, North Wales, 1740-1919, and South Wales, 1740-1974 Production of pig iron, by type, South Wales, 1886-1974 Production of steel ingots and castings, by type of furnace, South Wales, 1878-1886 and 1920-1974 Tinplate. Average number of mills working, 1869-1937; and total production, 1834-1974, UK Prices (per ton). Bar iron (Newport), 1803-1823, 1866-1877; bar iron (London) 1812-1840; pig iron 1802-1823, 1863-18 80; railway iron 1843-1852; tinplate bars 1913-1943 Prices (per box f.o.b. Swansea). Tinplate, 1827-1943 Please note: this study does not include information on named individuals and would therefore not be useful for personal family history research.