MEDIEVAL TRADE AND INDUSTRY  - General Bibliography 
 30 MINING AND METALLURGY                                       
- Cambridge (), Cambridge Economic History  II. ch. VII.
 - Derry & T.I. Williams, T.K. (), A Short History of Technology  ch.  IV pp. l28-l40.
 - Gimpel, J. (1976), The Medieval Machine     cap:3.
 - Hodgett, G.A.J. (), Social and Economic History  ch. l3.
 - Lewis, E.A. (1903), Development of Industry and Commerce in Wales  during the Middle Ages, T.R.H.S.
 - McGrail, ed, S. (1982), Woodworking Techniques before 1500 AD  BAR   (on wrought iron decoration of church doors).
 - Nef: J.U. (), The Conquest of the Material World,   ch I, pp.3-42.
 - Raistrick & B. Jennings, A. (), History of Lead Mining in the Mendips   chs. 2 & 3.
 - Salzmann, L.F. (), Medieval English Industries   chs. I, II, III & IV.
 - Salzman, L.F. (), Medieval English Industry  ch. VII.