1. Carson, R., Silent Spring (Alfred A. Knopf, 1962).
2. Final Environmental Impact Statement on Proposed Trans-Alaska Pipeline (National Technical Information Service, US Dept of Commerce).
3. First Report of Royal Commission on Environmental Pollution (HMSO, 1971).
4. Environmental Quality (Annual Report of Council on Environmental Quality, 1971).
5. Peterle, T. J., Nature, 224, 620 (1969).