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>. Output of copper ore in tons, by main counties, 1855-1919 Copper ore sold at Swansea ticketings, 1804-1881; and imports of copper ore and unwrought copper to Swansea, 1832-1874, and Llanelli 1832-1898 Lead ore. Output and number of mines recording sales, by main counties, 1845-1948 Zinc ore. Ouput, by main counties, 1854-1938; Bluestone, output, Anglesey, 1863-1917 Slate and slate slabs. Output, main counties, 1882-1938; and Wales 1882-1974 Gold and silver, output, 1854-1920 Limestone, sandstone and igneous rocks, output, 1895-1974 Employment. Numbers employed in metalliferous mines, by county, 1872-1926 Employment. Numbers employed in slate mines and quarries, by county, 1884-1926 Employment. Deaths in metalliferous mines and quarries, North Wales and South Wales, 1873-1926 Price of lead, 1620-1765, and of lead ore, 1662-1809 and 1859-1882 Please note: this study does not include information on named individuals and would therefore not be useful for personal family history research.