REFERENCES
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- 'Energy use patterns in metallurgical and non-metallic mineral processing: Phase 4- Energy data and flow sheets, high-priority commodities', Battelle, Columbus, Ohio, 1975; Open File Report 80–75, US Bureau of Mines, Washington, DC.
- C. L. CUSIK and C. B. KENAHAN: 'Energy use patterns for metal recycling', Information Circular 8781, US Bureau of Mines, Washington. DC, 1978, 100–111.