1. C. G. Downs and J. Stocks, Environmental Impact of Mining (London: Applied Science Publishers, 1977).
2. For an overview, see Office of Technology Assessment, The Direct Use of Coal (Washington, D. C: US Government Printing Office, 1979)
3. United Nations Economic Commission for Europe, Environment and Energy (London: Pergamon, 1979)
4. C. W. Gehrs et al., ‘Environmental health and safety implications of increased coal utilisation’, in M. A. Elliott (ed.), Chemistry of Coal Utilisation (New York: Wiley, 1980)
5. Commission on Energy and the Environment, Coal and the Environment (London: Her Majesty’s Stationery Office, 1981).