REFERENCES
- et al. ., 1986 , “Beyond the Era of Materials” , Scientific American , v. 254 , n. 6, June , pp. 34 – 41 .
- For an extended dicussion. See National Academy of Sciences ., 1982 , “Mineral Demand Modeling. Report prepared by the Committee on Natural Mineral Demand Relationship” , based on Mineral Energy Resources , Washington National Academy Press 130 p.
- ∗ The article is adapted from a forthcoming paper in the Natural Resources Forum. Dr. Gulley was the architect and organizer of the Arden House conference. Financial assistance and advice were provided by the Division of Mineral Policy and Analysis, U.S. Bureau of Mines. Dr. Hermann Enzer, Director Patricia Devinc, and Stanley Miller deserve a special thanks