1. and in Methods of Soil Analysis, Ed., American Society of Agronomy, Madison, Wise., 1965, p. 1346.
2. American Petroleum Institute, A. P. I. Research Project No. 4 (loseleaf), Thermodynamics Res. Ctr., Texas A & M. University, College Station, Texas, 1950.
3. New Books
4. An Environment Staff Report: Horizon to Horizon
5. and this issue, p. 309.