Tony, I assume the three are: 1. Grant-Francis, The Development of Copper Smelting in the Swansea District in 1881 2. Rees, R. King Copper. 3. Hughes, S. Copperopolis...... Other useful sources are: 1. Newell, E.,''Copperopolis': The Rise and Fall of the Copper Industry in the Swansea District, 1826 - 1921'. Economic History Review, vol 26, 1970, 75 - 97. 2. Roberts, R., 'Copper and Economic Growth in Britain 1729 - 1784'. Journal of theNational Library of Wales, vol 10, no 1, 65 - 74. 3. Hughes, S. and Reynolds, P., A guide to the Industrial Archaeology of the Swansea Region, RCHMW, 1992. Yours John