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2. Yearbook, Am. Bureau of Metal Statistics, New York, 1920–1971.
3. Mineral Commodity Profiles, U.S. Bur. of Mines, Lead (1977), Aluminum (1978), Zinc (1978), Copper (1979).
4. H.H. Kellogg, “Trends in Nonferrous Pyrometallurgy,” in Metallurgical Treatises, edited by J.K. Tien and J.F. Elliott, The Metallurgical Society of AIME, Warrendale, Pennsylvania, 1981, pp. 119–135.
5. H.H. Kellogg, “Melting Cathode Copper — A Case Study in Process Energy Efficiency,” Metall. Trans. 6B, (1975), pp. 77–81.