1. “Materials: Renewable and Nonrenewable Resources,”;Abelson,1976
2. “Materials; Renewable and Nonrenewable Resources,”;Landsberg,1976
3. “Materials: Renewable and Nonrenewable Resources,”;Huddle,1976
4. “Materials: Renewable and Nonrenewable Resources,”;Goldstein,1976
5. Moore, C. A., Reprint of Papers, Div. of Chem. Mark. and Econ., p. 73, Amer. Chem. Soc. Meeting, Philadelphia, Pennsylvania, April 7–9, 1975.