1. Energy requirements in the production of metals;Bravard;Oak Ridge Laboratory Report,1971
2. The energy costs of producing copper and aluminium from primary sources;Chapman;Open University Report ERG 001,1973
3. The energy costs of producing copper and aluminium from secondary sources;Chapman;Open University Report ERG 002,1973
4. Energy equivalents of network inputs to the food production process;Leach;Strathclyde University Report,1973
5. Cumulative energy requirements of some products of the chemical industry;Smith,1969